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Full vulnerability report · 2026
CVE-2026-73266High confidence

Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join

Red Hat · multicluster engine for Kubernetes 2.10

Official source article: Red Hat RHSA-2026:59556 ↗. Check the applicable product and release in the original source.

7.1HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.35% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat multicluster engine for Kubernetes 2.10 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-73266 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityclusterclaims-controller: Confused deputy: tenant-controlled ClusterClaim labels propagated to ManagedCluster, enabling cross-tenant ManagedClusterSet join
24 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:506d28cb18be265378d3fa9732fe363e680f73605c1e5089a47f831bfb70bc3d_amd64 as a component of multicluster engine for Kubernetes 2.10
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7edb2ca12ef15a090ed4169cb8618bc131a02f20a7b3e2e665fd4a8a862eec95_arm64 as a component of multicluster engine for Kubernetes 2.10
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:b86b487802600bd2dc1bb49d0ebb90066658ed423e1c2eabb4fd85a9afac0e06_ppc64le as a component of multicluster engine for Kubernetes 2.10
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:c988e9854b206ec43fdce4fa6c3d3787cb438cecf936b3c2c7f78034227da6a2_s390x as a component of multicluster engine for Kubernetes 2.10
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:18efffa3312d0790befc55888b08cf06f0af94f17c229a3b827c7265c1f9cae3_amd64 as a component of multicluster engine for Kubernetes 2.11
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:630b3d18f5a07192b130a9a286b6a4672737cf61a71446f4ea639f0d74862128_s390x as a component of multicluster engine for Kubernetes 2.11
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:76ccd7f63714b940790058c4415bea488c6cca1d9853bbcd2ec1553a0822115c_arm64 as a component of multicluster engine for Kubernetes 2.11
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:abdb62d8d0c9555c821cee989f1042b5b65d9f1baccc45bf27128a50352fd233_ppc64le as a component of multicluster engine for Kubernetes 2.11
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:0adf4aa4563a8c2b5d6b968278edc0e4c585d40834047a380164d9d473cbf142_amd64 as a component of multicluster engine for Kubernetes 2.17
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:32d7ec0808d27c280a95f1b8868bd7e539dfc0ec49d5afdc064dd1b253a0e610_s390x as a component of multicluster engine for Kubernetes 2.17
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:58c3d53c9d99f48373f06f3c84b9d0329016638b325fe814bd648e31f26d4286_ppc64le as a component of multicluster engine for Kubernetes 2.17
  • registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:89642ff33cd54b72dc65ee998f67bdff39dcd48f5710ee44b1fac696f666a3ea_arm64 as a component of multicluster engine for Kubernetes 2.17
Summary
A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.
Remediation
For multicluster engine for Kubernetes, see the following documentation for details on how to install the images: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.15/html/clusters/cluster_mce_overview#mce-install-intro
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-58132

No EUVD known-exploited evidence

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

What

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

Why

The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

Why

The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Unintended Proxy or Intermediary ('Confused Deputy') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-441 ↗

CWE-441: Unintended Proxy or Intermediary ('Confused Deputy'). The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CHighConfidentiality impact: A successful attack can cause a major loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-441
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-58132Official EUVD mapping

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260819Security Bulletin 19 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 19 Aug 2026, published on 19 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For multicluster engine for Kubernetes, see the following documentation for details on how to install the images: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.15/html/clusters/cluster_mce_overview#mce-install-intro
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 13 Aug 2026 · Last source change 29 Sept 2026, 19:41 UTC · CWE-441 · Unintended Proxy or Intermediary ('Confused Deputy')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-58132
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: multicluster engine for Kubernetes 2.1: 1787196014 < *; multicluster engine for Kubernetes 2.11: 1787239442 < *; multicluster engine for Kubernetes 2.17: 1786577950 < *; multicluster engine for Kubernetes 2.6: 1787259112 < *; multicluster engine for Kubernetes 2.8: 1787259059 < *; multicluster engine for Kubernetes 2.9: 1787195995 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: multicluster engine for Kubernetes 2.10: 1787196014 < *; multicluster engine for Kubernetes 2.11: 1787239442 < *; multicluster engine for Kubernetes 2.17: 1786577950 < *; multicluster engine for Kubernetes 2.6: 1787259112 < *; multicluster engine for Kubernetes 2.8: 1787259059 < *; multicluster engine for Kubernetes 2.9: 1787195995 < *
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-73266 to remediation: access.redhat.com/CVE-2026-73266.
    Before
    remediation: access.redhat.com/CVE-2026-73266
    After
    remediation: access.redhat.com/CVE-2026-73266
    Red Hat Product Security ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    Fixed: registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:18efffa3312d0790befc55888b08cf06f0af94f17c229a3b827c7265c1f9cae3_amd64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:630b3d18f5a07192b130a9a286b6a4672737cf61a71446f4ea639f0d74862128_s390x as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:76ccd7f63714b940790058c4415bea488c6cca1d9853bbcd2ec1553a0822115c_arm64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:abdb62d8d0c9555c821cee989f1042b5b65d9f1baccc45bf27128a50352fd233_ppc64le as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:0adf4aa4563a8c2b5d6b968278edc0e4c585d40834047a380164d9d473cbf142_amd64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:32d7ec0808d27c280a95f1b8868bd7e539dfc0ec49d5afdc064dd1b253a0e610_s390x as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:58c3d53c9d99f48373f06f3c84b9d0329016638b325fe814bd648e31f26d4286_ppc64le as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:89642ff33cd54b72dc65ee998f67bdff39dcd48f5710ee44b1fac696f666a3ea_arm64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:506d28cb18be265378d3fa9732fe363e680f73605c1e5089a47f831bfb70bc3d_amd64 as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7edb2ca12ef15a090ed4169cb8618bc131a02f20a7b3e2e665fd4a8a862eec95_arm64 as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:b86b487802600bd2dc1bb49d0ebb90066658ed423e1c2eabb4fd85a9afac0e06_ppc64le as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:c988e9854b206ec43fdce4fa6c3d3787cb438cecf936b3c2c7f78034227da6a2_s390x as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:397436d12ac747fdc502d412827d62f464b6e1646ae450aa62d72568800af8ac_ppc64le as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:85e38c6db2cd8334193ca48b9e9337c1f0040e4612d40d3f4b623cfd93fd5aed_s390x as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:9e46982f2db62f99b2410fe6639230cf9133617ff79a01266ae2ec2169dddc31_arm64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:daf8858158bbc24d0078ce4d7a217b7ab014df8e54a9c906f7c2b0e78e521cf4_amd64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:10afacd0dfb727bcae117cb5e852cd840c81b8e45acd37c55ac75c97316b3910_amd64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:1728de829fbb54d6965cbea34260618c09b8f87dd6a6f315e563406ac84d1a92_arm64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:26a2ba7c401b24135d8d822d5e228f1b9402a8be2d8037daf2c3dea858e9d9e7_s390x as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:35cc5cabd17d739bd401d73850c8efe2576ea99120f313b3e4668799233c7967_ppc64le as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:07d4a93839c847bc581207bf59f553c565512e84d8da06dc14f412376e6fba62_arm64 as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:6eeae55b1b195b89dccf5c4130b7679c779c26d401d3dee212929dc57cd016a9_s390x as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7a9ba3d78c6376affe4225f7cbf3600982c965b953984651cca247a327af6c21_ppc64le as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:a3def721c1199c1f38ec6c4cf4dfb572732686e1e5a06d20f605c85ab55de76d_amd64 as a component of multicluster engine for Kubernetes 2.9
    After
    Fixed: registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:506d28cb18be265378d3fa9732fe363e680f73605c1e5089a47f831bfb70bc3d_amd64 as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7edb2ca12ef15a090ed4169cb8618bc131a02f20a7b3e2e665fd4a8a862eec95_arm64 as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:b86b487802600bd2dc1bb49d0ebb90066658ed423e1c2eabb4fd85a9afac0e06_ppc64le as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:c988e9854b206ec43fdce4fa6c3d3787cb438cecf936b3c2c7f78034227da6a2_s390x as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:18efffa3312d0790befc55888b08cf06f0af94f17c229a3b827c7265c1f9cae3_amd64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:630b3d18f5a07192b130a9a286b6a4672737cf61a71446f4ea639f0d74862128_s390x as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:76ccd7f63714b940790058c4415bea488c6cca1d9853bbcd2ec1553a0822115c_arm64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:abdb62d8d0c9555c821cee989f1042b5b65d9f1baccc45bf27128a50352fd233_ppc64le as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:0adf4aa4563a8c2b5d6b968278edc0e4c585d40834047a380164d9d473cbf142_amd64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:32d7ec0808d27c280a95f1b8868bd7e539dfc0ec49d5afdc064dd1b253a0e610_s390x as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:58c3d53c9d99f48373f06f3c84b9d0329016638b325fe814bd648e31f26d4286_ppc64le as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:89642ff33cd54b72dc65ee998f67bdff39dcd48f5710ee44b1fac696f666a3ea_arm64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:397436d12ac747fdc502d412827d62f464b6e1646ae450aa62d72568800af8ac_ppc64le as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:85e38c6db2cd8334193ca48b9e9337c1f0040e4612d40d3f4b623cfd93fd5aed_s390x as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:9e46982f2db62f99b2410fe6639230cf9133617ff79a01266ae2ec2169dddc31_arm64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:daf8858158bbc24d0078ce4d7a217b7ab014df8e54a9c906f7c2b0e78e521cf4_amd64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:10afacd0dfb727bcae117cb5e852cd840c81b8e45acd37c55ac75c97316b3910_amd64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:1728de829fbb54d6965cbea34260618c09b8f87dd6a6f315e563406ac84d1a92_arm64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:26a2ba7c401b24135d8d822d5e228f1b9402a8be2d8037daf2c3dea858e9d9e7_s390x as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:35cc5cabd17d739bd401d73850c8efe2576ea99120f313b3e4668799233c7967_ppc64le as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:07d4a93839c847bc581207bf59f553c565512e84d8da06dc14f412376e6fba62_arm64 as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:6eeae55b1b195b89dccf5c4130b7679c779c26d401d3dee212929dc57cd016a9_s390x as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7a9ba3d78c6376affe4225f7cbf3600982c965b953984651cca247a327af6c21_ppc64le as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:a3def721c1199c1f38ec6c4cf4dfb572732686e1e5a06d20f605c85ab55de76d_amd64 as a component of multicluster engine for Kubernetes 2.9
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: multicluster engine for Kubernetes 2.10: 1787196014 < *; multicluster engine for Kubernetes 2.11: 1787239442 < *; multicluster engine for Kubernetes 2.17: 1786577950 < *; multicluster engine for Kubernetes 2.6: 1787259112 < *; multicluster engine for Kubernetes 2.8: 1787259059 < *; multicluster engine for Kubernetes 2.9: 1787195995 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: multicluster engine for Kubernetes 2.1: 1787196014 < *; multicluster engine for Kubernetes 2.11: 1787239442 < *; multicluster engine for Kubernetes 2.17: 1786577950 < *; multicluster engine for Kubernetes 2.6: 1787259112 < *; multicluster engine for Kubernetes 2.8: 1787259059 < *; multicluster engine for Kubernetes 2.9: 1787195995 < *
    CNA ↗
  5. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:59556; removed remediation: access.redhat.com/RHSA-2026:59557; removed vendor advisory: access.redhat.com/RHSA-2026:59557; 3 further removals.
    Before
    remediation: access.redhat.com/RHSA-2026:59557 · vendor advisory: access.redhat.com/RHSA-2026:59557 · vendor advisory: access.redhat.com/RHSA-2026:59558 · 2 more references
    After
    remediation: access.redhat.com/RHSA-2026:59556
    CNA ↗
  6. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-73266 to remediation: access.redhat.com/CVE-2026-73266.
    Before
    remediation: access.redhat.com/CVE-2026-73266
    After
    remediation: access.redhat.com/CVE-2026-73266
    Red Hat Product Security ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    Fixed: registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:506d28cb18be265378d3fa9732fe363e680f73605c1e5089a47f831bfb70bc3d_amd64 as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7edb2ca12ef15a090ed4169cb8618bc131a02f20a7b3e2e665fd4a8a862eec95_arm64 as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:b86b487802600bd2dc1bb49d0ebb90066658ed423e1c2eabb4fd85a9afac0e06_ppc64le as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:c988e9854b206ec43fdce4fa6c3d3787cb438cecf936b3c2c7f78034227da6a2_s390x as a component of multicluster engine for Kubernetes 2.10; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:18efffa3312d0790befc55888b08cf06f0af94f17c229a3b827c7265c1f9cae3_amd64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:630b3d18f5a07192b130a9a286b6a4672737cf61a71446f4ea639f0d74862128_s390x as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:76ccd7f63714b940790058c4415bea488c6cca1d9853bbcd2ec1553a0822115c_arm64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:abdb62d8d0c9555c821cee989f1042b5b65d9f1baccc45bf27128a50352fd233_ppc64le as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:0adf4aa4563a8c2b5d6b968278edc0e4c585d40834047a380164d9d473cbf142_amd64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:32d7ec0808d27c280a95f1b8868bd7e539dfc0ec49d5afdc064dd1b253a0e610_s390x as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:58c3d53c9d99f48373f06f3c84b9d0329016638b325fe814bd648e31f26d4286_ppc64le as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:89642ff33cd54b72dc65ee998f67bdff39dcd48f5710ee44b1fac696f666a3ea_arm64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:397436d12ac747fdc502d412827d62f464b6e1646ae450aa62d72568800af8ac_ppc64le as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:85e38c6db2cd8334193ca48b9e9337c1f0040e4612d40d3f4b623cfd93fd5aed_s390x as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:9e46982f2db62f99b2410fe6639230cf9133617ff79a01266ae2ec2169dddc31_arm64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:daf8858158bbc24d0078ce4d7a217b7ab014df8e54a9c906f7c2b0e78e521cf4_amd64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:10afacd0dfb727bcae117cb5e852cd840c81b8e45acd37c55ac75c97316b3910_amd64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:1728de829fbb54d6965cbea34260618c09b8f87dd6a6f315e563406ac84d1a92_arm64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:26a2ba7c401b24135d8d822d5e228f1b9402a8be2d8037daf2c3dea858e9d9e7_s390x as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:35cc5cabd17d739bd401d73850c8efe2576ea99120f313b3e4668799233c7967_ppc64le as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:07d4a93839c847bc581207bf59f553c565512e84d8da06dc14f412376e6fba62_arm64 as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:6eeae55b1b195b89dccf5c4130b7679c779c26d401d3dee212929dc57cd016a9_s390x as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7a9ba3d78c6376affe4225f7cbf3600982c965b953984651cca247a327af6c21_ppc64le as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:a3def721c1199c1f38ec6c4cf4dfb572732686e1e5a06d20f605c85ab55de76d_amd64 as a component of multicluster engine for Kubernetes 2.9
    After
    Fixed: registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:18efffa3312d0790befc55888b08cf06f0af94f17c229a3b827c7265c1f9cae3_amd64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:630b3d18f5a07192b130a9a286b6a4672737cf61a71446f4ea639f0d74862128_s390x as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:76ccd7f63714b940790058c4415bea488c6cca1d9853bbcd2ec1553a0822115c_arm64 as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:abdb62d8d0c9555c821cee989f1042b5b65d9f1baccc45bf27128a50352fd233_ppc64le as a component of multicluster engine for Kubernetes 2.11; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:0adf4aa4563a8c2b5d6b968278edc0e4c585d40834047a380164d9d473cbf142_amd64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:32d7ec0808d27c280a95f1b8868bd7e539dfc0ec49d5afdc064dd1b253a0e610_s390x as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:58c3d53c9d99f48373f06f3c84b9d0329016638b325fe814bd648e31f26d4286_ppc64le as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:89642ff33cd54b72dc65ee998f67bdff39dcd48f5710ee44b1fac696f666a3ea_arm64 as a component of multicluster engine for Kubernetes 2.17; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:506d28cb18be265378d3fa9732fe363e680f73605c1e5089a47f831bfb70bc3d_amd64 as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7edb2ca12ef15a090ed4169cb8618bc131a02f20a7b3e2e665fd4a8a862eec95_arm64 as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:b86b487802600bd2dc1bb49d0ebb90066658ed423e1c2eabb4fd85a9afac0e06_ppc64le as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:c988e9854b206ec43fdce4fa6c3d3787cb438cecf936b3c2c7f78034227da6a2_s390x as a component of multicluster engine for Kubernetes 2.1; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:397436d12ac747fdc502d412827d62f464b6e1646ae450aa62d72568800af8ac_ppc64le as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:85e38c6db2cd8334193ca48b9e9337c1f0040e4612d40d3f4b623cfd93fd5aed_s390x as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:9e46982f2db62f99b2410fe6639230cf9133617ff79a01266ae2ec2169dddc31_arm64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:daf8858158bbc24d0078ce4d7a217b7ab014df8e54a9c906f7c2b0e78e521cf4_amd64 as a component of multicluster engine for Kubernetes 2.6; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:10afacd0dfb727bcae117cb5e852cd840c81b8e45acd37c55ac75c97316b3910_amd64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:1728de829fbb54d6965cbea34260618c09b8f87dd6a6f315e563406ac84d1a92_arm64 as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:26a2ba7c401b24135d8d822d5e228f1b9402a8be2d8037daf2c3dea858e9d9e7_s390x as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:35cc5cabd17d739bd401d73850c8efe2576ea99120f313b3e4668799233c7967_ppc64le as a component of multicluster engine for Kubernetes 2.8; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:07d4a93839c847bc581207bf59f553c565512e84d8da06dc14f412376e6fba62_arm64 as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:6eeae55b1b195b89dccf5c4130b7679c779c26d401d3dee212929dc57cd016a9_s390x as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:7a9ba3d78c6376affe4225f7cbf3600982c965b953984651cca247a327af6c21_ppc64le as a component of multicluster engine for Kubernetes 2.9; registry.redhat.io/multicluster-engine/clusterclaims-controller-rhel9@sha256:a3def721c1199c1f38ec6c4cf4dfb572732686e1e5a06d20f605c85ab55de76d_amd64 as a component of multicluster engine for Kubernetes 2.9
    Red Hat Product Security ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1787196014 < *; 1787239442 < *; 1786577950 < *; 1787259112 < *; 1787259059 < *; 1787195995 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: multicluster engine for Kubernetes 2.10: 1787196014 < *; multicluster engine for Kubernetes 2.11: 1787239442 < *; multicluster engine for Kubernetes 2.17: 1786577950 < *; multicluster engine for Kubernetes 2.6: 1787259112 < *; multicluster engine for Kubernetes 2.8: 1787259059 < *; multicluster engine for Kubernetes 2.9: 1787195995 < *
    CNA ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:59557; added vendor advisory: access.redhat.com/RHSA-2026:59557; removed remediation: access.redhat.com/RHSA-2026:59556; 3 further additions.
    Before
    remediation: access.redhat.com/RHSA-2026:59556
    After
    remediation: access.redhat.com/RHSA-2026:59557 · vendor advisory: access.redhat.com/RHSA-2026:59557 · vendor advisory: access.redhat.com/RHSA-2026:59558 · 2 more references
    access.redhat.com ↗
  10. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1787239442 < *; 1786577950 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 1787196014 < *; 1787239442 < *; 1786577950 < *; 1787259112 < *; 1787259059 < *; 1787195995 < *
    CNA ↗
  11. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:59556; removed remediation: access.redhat.com/RHSA-2026:59593; removed vendor advisory: access.redhat.com/RHSA-2026:59593.
    Before
    remediation: access.redhat.com/RHSA-2026:59593 · vendor advisory: access.redhat.com/RHSA-2026:59593
    After
    remediation: access.redhat.com/RHSA-2026:59556
    CNA ↗
  12. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:59593; added vendor advisory: access.redhat.com/RHSA-2026:59593; removed remediation: access.redhat.com/RHSA-2026:59556.
    Before
    remediation: access.redhat.com/RHSA-2026:59556
    After
    remediation: access.redhat.com/RHSA-2026:59593 · vendor advisory: access.redhat.com/RHSA-2026:59593
    access.redhat.com ↗
  13. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1787239442 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 1787239442 < *; 1786577950 < *
    CNA ↗
  14. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: access.redhat.com/RHSA-2026:59556.
    Before
    remediation: access.redhat.com/RHSA-2026:59556 · vendor advisory: access.redhat.com/RHSA-2026:59556
    After
    remediation: access.redhat.com/RHSA-2026:59556
    CNA ↗
  15. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:59556; added vendor advisory: access.redhat.com/RHSA-2026:59556.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:59556 · vendor advisory: access.redhat.com/RHSA-2026:59556
    access.redhat.com ↗
  16. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    See the vendor and CVE records for the affected range. · Fixed: 1787239442 < *
    CNA ↗
  17. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    access.redhat.com ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-58132↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:59556↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-73266 · cve.blacktree.nl