---
id: CVE-2026-76827
title: A flaw was found in search-indexer
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-in…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N'
cwe:
  - CWE-693
published: '2026-08-19'
updated: '2026-09-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76827'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:60386'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60387'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60388'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60389'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60390'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60391'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-76827'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2519896'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76827.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-76827'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76827'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00525
epssPercentile: 0.42113
ingestedAt: '2026-09-05T19:43:55.542Z'
vendor: Red Hat
product: Red Hat Advanced Cluster Management for Kubernetes 2.11
affected:
  - advanced_cluster_management_for_kubernetes 2.11
  - advanced_cluster_management_for_kubernetes 2.13
  - advanced_cluster_management_for_kubernetes 2.14
  - advanced_cluster_management_for_kubernetes 2.15
  - advanced_cluster_management_for_kubernetes 2.16
  - advanced_cluster_management_for_kubernetes 2.17
patched:
  - advanced_cluster_management_for_kubernetes 2.11
  - advanced_cluster_management_for_kubernetes 2.13
  - advanced_cluster_management_for_kubernetes 2.14
  - advanced_cluster_management_for_kubernetes 2.15
  - advanced_cluster_management_for_kubernetes 2.16
  - advanced_cluster_management_for_kubernetes 2.17
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:60387** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.11 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60387)
- **RHSA-2026:60390** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.13 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60390)
- **RHSA-2026:60388** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.14 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60388)
- **RHSA-2026:60389** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.15 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60389)
- **RHSA-2026:60391** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60391)
- **RHSA-2026:60386** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60386)