CVE-2026-76827

MEDIUM 6.8

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

CVSS Score

6.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-693
Vendor	red hat
Product	red hat advanced cluster management for kubernetes 2.11
Published	Aug 19, 2026
Last Updated	Sep 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.11

All versions affected

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.13

All versions affected

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.14

All versions affected

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.15

All versions affected

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.16

All versions affected

Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.17

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗