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Advisory record · GHSA-hq3p-w4xv-x7vp

Keycloak: Access token disclosure and implicit flow bypass via forged client data

CVSS 7.1 HighEPSS 0.0042 · 35th percentile

Published by the GitHub Advisory Database at 19 May 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.6.226.6.2
Identifiers
GHSA-hq3p-w4xv-x7vp · BIT-keycloak-2026-7571 · CVE-2026-7571
Weakness (CWE)
CWE-472
Tags
Published
19 May 2026
Updated
26 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-services, versions before 26.6.2) is vulnerable. An attacker who has a low-privilege user's credentials and the client ID can bypass the control that disables the implicit flow in OIDC clients by manipulating client data during a session restart, obtaining access tokens they should not receive; those tokens may also leak into server logs, proxy logs, and HTTP Referrer headers. Upgrade to version 26.6.2.

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
7.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0042, the 35th percentile, on 5 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.