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Full vulnerability report · 2026
CVE-2026-76827High confidence

Search-indexer: search-indexer: update/delete operations not scoped to caller's cluster (cross-tenant data tampering)

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.

6.8MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.53% 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: As exposure requiresRemediation target: Within 365 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-2026-76827 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysearch-indexer: search-indexer: UPDATE/DELETE operations not scoped to caller's cluster (cross-tenant data tampering)
24 fixed

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

  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:409f6a65f728e6bbd716980f12308a95ee5a3e8948efb4fd1836e5622f8d09b6_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:49ea593126ace055c2e506cece047d9ee9070218313e5bc0d19f32ba26f1931f_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c3fbcc9a7755a5694cf25ffa8e560b372554bf5963348d80c68c909a3ec1aa3a_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:d087fd8b0abbda04151a053b91c09f27c584d822745ea8e4b40e60d5d116db1c_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:0afea097f1b5c8abec405cb1862b441017c9059af8c559ee7bd9099356153f6f_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:48832210f0fa29bf2d0707df50ba75e5f4eac58118f43014349dc0bb79583db0_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:ead54ff8c1e345d0f0022148b3d31c835e5478d637330139a60d78a41c07ca02_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:f65cd2205d83c6f02d8f9c287c17df35c4fa1297b260ff9b410fef90dd74c562_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:267880a462724d891c8813f85d36319650ab96df69c554a5b4adc2dd88406006_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c082bab3ba0217b16302ed54d09a1d5aa17724d6322e4a49f53cee1adb7ebb67_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c1bf8beb9ca058a30e02a3b04b485edf5a11d637fa5562ecbd51326dfec1b5b4_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
  • registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:e13e601fc3488fe2c2a4f752e727a121ee365dc46e4c4785bbb1a17f0aa1d6fe_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14
Summary
A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.
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-2026-63091

No EUVD known-exploited evidence

A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.

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
6.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.

What

A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.

Why

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

How

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

What

A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.

Why

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

How

An attacker operating through a network path may attempt exploitation with elevated 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 → Protection Mechanism Failure → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
High: elevated access 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-693 ↗

CWE-693: Protection Mechanism Failure. The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

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:H/UI:N/S:C/C:N/I:H/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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CNoneConfidentiality impact: No direct loss is represented by this metric.IHighIntegrity impact: A successful attack can cause a major 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-693
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-63091Official EUVD mapping

A flaw was found in search-indexer. This vulnerability allows a registered and authenticated managed cluster to tamper with or delete another cluster's indexed search data. This is possible because the delta-sync write paths in search-indexer do not properly restrict UPDATE/DELETE operations to data owned by the calling cluster. An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix.

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 19 Aug 2026 · Last source change 5 Sept 2026, 17:08 UTC · CWE-693 · Protection Mechanism Failure

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-2026-63091
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: 1787688957 < *; 1787262474 < *; 1787250074 < *; 1787249293 < *; 1787248491 < *; 1787247085 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Advanced Cluster Management for Kubernetes 2.11: 1787688957 < *; Red Hat Advanced Cluster Management for Kubernetes 2.13: 1787262474 < *; Red Hat Advanced Cluster Management for Kubernetes 2.14: 1787250074 < *; Red Hat Advanced Cluster Management for Kubernetes 2.15: 1787249293 < *; Red Hat Advanced Cluster Management for Kubernetes 2.16: 1787248491 < *; Red Hat Advanced Cluster Management for Kubernetes 2.17: 1787247085 < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1787262474 < *; 1787249293 < *; 1787247085 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: 1787688957 < *; 1787262474 < *; 1787250074 < *; 1787249293 < *; 1787248491 < *; 1787247085 < *
    CNA ↗
  3. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-76827 to remediation: access.redhat.com/CVE-2026-76827.
    Before
    remediation: access.redhat.com/CVE-2026-76827
    After
    remediation: access.redhat.com/CVE-2026-76827
    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/acm-search-indexer-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
    After
    Fixed: registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:409f6a65f728e6bbd716980f12308a95ee5a3e8948efb4fd1836e5622f8d09b6_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:49ea593126ace055c2e506cece047d9ee9070218313e5bc0d19f32ba26f1931f_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c3fbcc9a7755a5694cf25ffa8e560b372554bf5963348d80c68c909a3ec1aa3a_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:d087fd8b0abbda04151a053b91c09f27c584d822745ea8e4b40e60d5d116db1c_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.11; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:0afea097f1b5c8abec405cb1862b441017c9059af8c559ee7bd9099356153f6f_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:48832210f0fa29bf2d0707df50ba75e5f4eac58118f43014349dc0bb79583db0_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:ead54ff8c1e345d0f0022148b3d31c835e5478d637330139a60d78a41c07ca02_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:f65cd2205d83c6f02d8f9c287c17df35c4fa1297b260ff9b410fef90dd74c562_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.13; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:267880a462724d891c8813f85d36319650ab96df69c554a5b4adc2dd88406006_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c082bab3ba0217b16302ed54d09a1d5aa17724d6322e4a49f53cee1adb7ebb67_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c1bf8beb9ca058a30e02a3b04b485edf5a11d637fa5562ecbd51326dfec1b5b4_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:e13e601fc3488fe2c2a4f752e727a121ee365dc46e4c4785bbb1a17f0aa1d6fe_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.14; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:7de2737aa0c7c52ad0f7cc80a7511f2d4a0e5187db7fffa89c8343eb4da62e86_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:9e8e10812b68ae49ba3f21b0071e194e3ba53de3f5ff3cdaaba49ebedee9e348_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:e95d5c256e4be1baece3edd357bac814783c0153b28fd8f3f4530d3e7d25ccc2_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:e9e281bbb15ed233c9e8ec00bec259295c2916007592d0f704f3f1e101a1cf80_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.15; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:0f64ed08659f4f30afe4e9ba47029928be40e412a3f5920e57bd4849a632e3b3_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:226dfdbb68afe4864de1a524a1c7e1029c16333f0e0eeaa88fb9fdee605b11e1_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:6677c7aefdd3049a61d245cac03f40da5dc3d606b0b1047dcd4d9572f032552c_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:9c1e50f5a102be335dedaa22cab1f58496557e9f8bcc66389ec0ad4012b20aee_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.16; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:10848d6a89aa7e9414be56694d8064bf441b630a14b4311bcef3cec05f60c29e_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:42e61394b31192ca7dc1b274342373f353e552dd70a15b3e9880642a05488d82_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:ac94a72b4a6a924f83a0e5f0a068bd9d92f4c4f787b18b61114ba3c07a8a6fb6_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/acm-search-indexer-rhel9@sha256:c6d759e9cb5761b314bb649076060549d4bb6140423c1a8325b0e7fe51ccc7f8_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17
    Red Hat Product Security ↗
  6. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: access.redhat.com/RHSA-2026:60386; removed vendor advisory: access.redhat.com/RHSA-2026:60389; 1 further removals.
    Before
    remediation: access.redhat.com/RHSA-2026:60386 · vendor advisory: access.redhat.com/RHSA-2026:60386 · vendor advisory: access.redhat.com/RHSA-2026:60389 · 1 more references
    After
    remediation: access.redhat.com/RHSA-2026:60386
    CNA ↗
  7. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:60386; added vendor advisory: access.redhat.com/RHSA-2026:60386; 2 further additions.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:60386 · vendor advisory: access.redhat.com/RHSA-2026:60386 · vendor advisory: access.redhat.com/RHSA-2026:60389 · 1 more references
    access.redhat.com ↗
  8. 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: 1787262474 < *; 1787249293 < *; 1787247085 < *
    CNA ↗
  9. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    access.redhat.com ↗
  10. 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-2026-63091↗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-2026-76827 · cve.blacktree.nl