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Advisory record · GHSA-cjm2-j6cm-6p6m

Keycloak: Redirect URI validation bypass via ..;/ path traversal in OIDC auth endpoint

CVSS 7.3 HighEPSS 0.0045 · 39th percentile

Published by the GitHub Advisory Database at 2 Apr 2026, 15:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.5.726.5.7
Identifiers
GHSA-cjm2-j6cm-6p6m · BIT-keycloak-2026-3872 · CVE-2026-3872
Weakness (CWE)
CWE-601
Tags
Published
2 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

Keycloak's keycloak-services package, versions before 26.5.7, is vulnerable. An attacker who controls another path on the same web server can bypass the allowed path in wildcard redirect URIs, which may lead to theft of an access token and information disclosure. Upgrade to version 26.5.7.

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
7.3 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0045, the 39th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.