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Advisory severityMedium6.5Red Hat Linux

Medium [CVE-2026-9796] Keycloak: keycloak: privilege escalation via time-of-check to time-of-use (toctou) vulnerability

This medium-severity Red Hat Linux advisory covers CVE-2026-9796 affecting Red Hat build of Keycloak 26.6.6.

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

CVE-2026-9796 Source published Source updated

VulniPulse record published

CVE-2026-9796
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks.

This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.

Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-367.

Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.6; Red Hat Build of Keycloak. Will not fix / out of support: Red Hat Build of Keycloak.

Red Hat fixing advisory: RHSA-2026:56524, RHSA-2026:56523.

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 8 days ago·verify at source

Fixed versions
  • rhbk/keycloak-operator-bundle:26.6.6-1
  • rhbk/keycloak-rhel9:26.6-12
  • rhbk/keycloak-rhel9-operator:26.6-12
  • rhbk-keycloak-rhel9/rhbk-keycloak-rhel9
  • RHSA-2026:56524
  • RHSA-2026:56523

Official advisory · high-confidence parse· fetched 8 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 8 days ago·verify at source

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