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Advisory severityMedium6.8Red Hat Linux

Medium [CVE-2026-76827] UPDATE/DELETE operations not scoped to caller's cluster (cross-tenant data tampering)

This medium-severity Red Hat Linux advisory covers CVE-2026-76827 affecting Red Hat Advanced Cluster Management for Kubernetes 2.11, Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Management for Kubernetes 2.14.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-76827 Source published Source updated

VulniPulse record published Record updated

CVE-2026-76827
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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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.

An attacker could exploit this by crafting specific user identifiers (UIDs) with a different cluster's prefix. This is a Moderate flaw in Red Hat Advanced Cluster Management for Kubernetes.

Exploitation requires already holding legitimate, authenticated managed-cluster credentials, which is why this does not reach Important severity. Red Hat severity: Moderate — CVSS 6.8 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N).

Weakness: CWE-693. Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386.

Affected products named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.11; Red Hat Advanced Cluster Management for Kubernetes 2.13; Red Hat Advanced Cluster Management for Kubernetes 2.14; Red Hat Advanced Cluster Management for Kubernetes 2.15; and 2 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Fixed versions
  • rhacm2/acm-search-indexer-rhel9:1787688957
  • rhacm2/acm-search-indexer-rhel9:1787262474
  • rhacm2/acm-search-indexer-rhel9:1787250074
  • rhacm2/acm-search-indexer-rhel9:1787249293
  • rhacm2/acm-search-indexer-rhel9:1787248491
  • rhacm2/acm-search-indexer-rhel9:1787247085
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:60391
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 22 days ago·verify at source

Discussion(0)

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