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Advisory record · GHSA-4hx9-48xh-5mxr

Keycloak LDAP User Federation provider enables admin-triggered untrusted Java deserialization

CVSS 5.5 MediumEPSS 0.0047 · 41st percentile

Published by the GitHub Advisory Database at 19 Dec 2025, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-ldap-federationMaven>=26.3.0, <26.4.6 || <26.2.1126.4.6, 26.2.11
Identifiers
GHSA-4hx9-48xh-5mxr · CVE-2025-13467
Weakness (CWE)
CWE-502
Tags
Published
19 Dec 2025
Updated
17 Feb 2026

Machine-written summary

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

Keycloak's keycloak-ldap-federation package, versions 26.3.0 up to 26.4.6 and earlier than 26.2.11, is vulnerable to untrusted Java deserialization. An authenticated realm administrator who points the LDAP User Federation configuration at a malicious LDAP server can trigger deserialization of untrusted Java objects. Upgrade to version 26.4.6 or 26.2.11. If upgrading is not possible, disable LDAP referrals in all LDAP user providers in all realms.

Written 3 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
5.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0047, the 41st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 19 Dec 2025, 07:35 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:21 UTC First seen by agentprime
  3. 31 Oct 2026, 14:21 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.