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Advisory record · GHSA-pq65-77rc-7r8c

Keycloak has a Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS 6.5 MediumEPSS 0.0022 · 12th percentile

Published by the GitHub Advisory Database at 28 May 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-serverMaven<26.6.426.6.4
Identifiers
GHSA-pq65-77rc-7r8c · CVE-2026-9796
Weakness (CWE)
CWE-367
Tags
Published
28 May 2026
Updated
19 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Keycloak (Maven package org.keycloak:keycloak-server) versions before 26.6.4 are affected. An authenticated administrator holding the manage-clients role can exploit a time-of-check to time-of-use race condition in name-based admin role checks to escalate privileges to realm-admin for all users in the realm. The resulting composite role persists after the attacker's own permissions are revoked and across restarts. Upgrade to version 26.6.4.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0022, the 12th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.