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Advisory record · GHSA-93ww-43rr-79v3

Keycloak mTLS Authentication Bypass via Reverse Proxy TLS Termination

CVSS 7.1 High

Published by the GitHub Advisory Database at 25 Nov 2024, 19:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-coreMaven<26.0.626.0.6
Identifiers
GHSA-93ww-43rr-79v3 · CVE-2024-10039
Weakness (CWE)
CWE-295
Tags
Published
25 Nov 2024
Updated
10 Sept 2026

Machine-written summary

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

Keycloak (org.keycloak:keycloak-core, Maven) versions before 26.0.6 are vulnerable. Deployments that put a reverse proxy in front of Keycloak, without pass-through TLS termination, and have mTLS enabled are affected. An attacker on the local network may be able to authenticate as any user or client that uses mTLS. Upgrade to version 26.0.6 or later.

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 25 Nov 2024, 15:21 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 14:17 UTC First seen by agentprime
  3. 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.