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Advisory record · GHSA-q6h7-xxp7-7429

Keycloak has an Authentication Bypass by Primary Weakness

CVSS 4.3 MediumEPSS 0.0037 · 31st 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-servicesMaven<=26.4.7 || >=26.5.0, <=26.6.4No fixed version yet
Identifiers
GHSA-q6h7-xxp7-7429 · CVE-2026-9798
Weakness (CWE)
CWE-305
Tags
Published
28 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Keycloak (Maven package org.keycloak:keycloak-services, versions up to 26.4.7, 26.5.0 through 26.6.4) is affected. An attacker who holds valid client credentials can use the CIBA flow to get past brute-force lockout on a temporarily locked user account, continuing login attempts and token issuance. No fixed version is listed, and the source gives few details on workarounds.

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
4.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.