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Full vulnerability report · 2026
CVE-2026-67567High confidence

Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart applied with controller sa without gvk or namespace restriction

Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.11

Official source article: Red Hat RHSA-2026:60386 ↗. Check the applicable product and release in the original source.

9.9CriticalCVSS 3.1
Recommended action
Within 7 days

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

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.62% 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 Red Hat Advanced Cluster Management for Kubernetes 2.11 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 3 daysRemediation target: Within 90 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-2026-67567 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitymulticloud-operators-subscription: multicloud-operators-subscription: HelmRelease chart applied with controller SA without GVK or namespace restriction
24 fixed

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

  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:34651d8005c0407444a36f6c30d6a2eaff0e6de9343e50eceabb1ba6e3e71d71_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:7130706447b1530f9bfde9d8ce3f44144b7ce2936a76c3b536838ec7a9151010_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9981b3d7cf1ce5bca251044e1e4bdc7aa0c36187d3afcff3090f77338b2d42a1_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:fdcd78a10d394fa844c443f77192fc70038c74c9ad6c0855fdbe1791c4e24cb1_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:001e8b921bdc6229be7b954c79609921545e7227f0588620fa5119c0c092b75c_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:7ec13a6f2b21f85d284d14783ace3ceded93f322577d7c0e1dc0384e42c7a844_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:b677c50b011d9ad2551e2bf00ec67a22a78e465f8cfccdfd001527e97ffc2a77_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:dd16c51dae5d2efd3ff2e29f81e3b7ae3f3f28a17e684ae888a83f5469307b06_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:4341ce0bc756c33bb1035dd63f907b9f60557d97ff8a76d53842b668845a6e84_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9246d7ed264daf4cb915224d27acd5cc4c11c64dab119cdd9830bcc7bdaedbc1_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9e45059a2c2b1ced8c089294a8191021472ab93bb726033c18fe5a0a4caa5a6d_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:afaeae9b62e211ffbafc0c271c313bf5119f62d2b8f8c8ba515e4de075011e22_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
Summary
A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.
Remediation
Before you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
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-2026-63589

No EUVD known-exploited evidence

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.

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
9.9 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

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

Patch available
01

What, why and how

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.

What

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.

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 gain additional privileges.

What

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.

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 gain additional privileges.

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') → gain additional privileges
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
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:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
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.
NetworkPrivilege escalationCWE-441
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-63589Official EUVD mapping

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a tenant, who has the ability to create HelmRelease custom resources (CRs), to bypass existing security controls. The system's HelmRelease controller processes Helm chart templates using its own elevated ServiceAccount privileges without proper validation. This enables the tenant to deploy arbitrary resources across the entire cluster, leading to a significant security compromise.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260826Security Bulletin 26 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 26 Aug 2026, published on 26 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
Before you apply this update, make sure all previously released errata that are relevant to your system are applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
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 20 Aug 2026 · Last source change 5 Sept 2026, 14:23 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 2026-08-23
European sourceENISA EUVD · EUVD-2026-63589
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: 1787263584 < *; 1787263693 < *; 1787170830 < *; 1787240030 < *; 1787242321 < *; 1787242108 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Advanced Cluster Management for Kubernetes 2.11: 1787263584 < *; Red Hat Advanced Cluster Management for Kubernetes 2.13: 1787263693 < *; Red Hat Advanced Cluster Management for Kubernetes 2.14: 1787170830 < *; Red Hat Advanced Cluster Management for Kubernetes 2.15: 1787240030 < *; Red Hat Advanced Cluster Management for Kubernetes 2.16: 1787242321 < *; Red Hat Advanced Cluster Management for Kubernetes 2.17: 1787242108 < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1787263693 < *; 1787240030 < *; 1787242108 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 1787263584 < *; 1787263693 < *; 1787170830 < *; 1787240030 < *; 1787242321 < *; 1787242108 < *
    CNA ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-67567 to remediation: access.redhat.com/CVE-2026-67567.
    Before
    remediation: access.redhat.com/CVE-2026-67567
    After
    remediation: access.redhat.com/CVE-2026-67567
    Red Hat Product Security ↗
  4. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    rhacm2/multicluster-operators-subscription-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
    After
    Fixed: registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:34651d8005c0407444a36f6c30d6a2eaff0e6de9343e50eceabb1ba6e3e71d71_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:7130706447b1530f9bfde9d8ce3f44144b7ce2936a76c3b536838ec7a9151010_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9981b3d7cf1ce5bca251044e1e4bdc7aa0c36187d3afcff3090f77338b2d42a1_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:fdcd78a10d394fa844c443f77192fc70038c74c9ad6c0855fdbe1791c4e24cb1_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:001e8b921bdc6229be7b954c79609921545e7227f0588620fa5119c0c092b75c_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:7ec13a6f2b21f85d284d14783ace3ceded93f322577d7c0e1dc0384e42c7a844_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:b677c50b011d9ad2551e2bf00ec67a22a78e465f8cfccdfd001527e97ffc2a77_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:dd16c51dae5d2efd3ff2e29f81e3b7ae3f3f28a17e684ae888a83f5469307b06_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:4341ce0bc756c33bb1035dd63f907b9f60557d97ff8a76d53842b668845a6e84_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9246d7ed264daf4cb915224d27acd5cc4c11c64dab119cdd9830bcc7bdaedbc1_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:9e45059a2c2b1ced8c089294a8191021472ab93bb726033c18fe5a0a4caa5a6d_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:afaeae9b62e211ffbafc0c271c313bf5119f62d2b8f8c8ba515e4de075011e22_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:111de84d72c62748e65f42035cd84f451c4efcfd379d1e788a3a4eb3f9641efc_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:2993c4840fe25d31847411a75a484e2364438bdbef4750fe14da2337f3c4e28e_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:b056c5ef6c877753299442854aac15888836cec2e58c152040cf1f02253db478_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:c19784144926c8d163bb9ac9e110a8766b0b352798ed5f455e094047cd2502dc_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:25b304beff994dc104239175cfa9e007540b6b2375cff959d2aad13b57474c16_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:8da433cd9f5225ce8c27f0adaa9dd078d02511dacb75a6bfda0331740317619a_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:a9169808ee07ddf155ea0dca8dcdee8297847a45727549483b23afcd4cc63ee2_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:cd1adb69f2fe24312c6c5be69ffcc94e912b7d434179b4ca16af0f709afb770a_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:30fcbdb8922683eb9df2ae16692f18b13b4f9e673433d1afa273da8390ebaee6_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:4d31034da93849c489eebb9740d95fb37efa13535090facc906376f02bdc2ac9_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:588fb1f554a770a6c31fefa0158e01f06f774298eb507e3cb7ff900192096133_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/multicluster-operators-subscription-rhel9@sha256:7fc5f3db89d74f09419421b2031bde01ba22968c4ca91a7cb3a26d1b1682d259_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17
    Red Hat Product Security ↗
  6. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:60386.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:60386
    CNA ↗
  7. 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: 1787263693 < *; 1787240030 < *; 1787242108 < *
    CNA ↗
  8. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    CNA ↗
  9. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
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-2026-63589↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:60386↗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-2026-67567 · cve.blacktree.nl