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Advisory record · GHSA-gv3v-2cpp-3pmq

Keycloak logs sensitive headers

CVSS 5.0 MediumEPSS 0.0017 · 6th percentile

Published by the GitHub Advisory Database at 10 Feb 2026, 12:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-quarkus-serverMaven<26.5.626.5.6
Identifiers
GHSA-gv3v-2cpp-3pmq · CVE-2025-11537
Weakness (CWE)
CWE-117
Tags
Published
10 Feb 2026
Updated
30 Oct 2026

Machine-written summary

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

Keycloak (org.keycloak:keycloak-quarkus-server, Maven) versions before 26.5.6 are affected. When the logging format is set to a verbose, user-supplied pattern such as the pre-defined 'long' pattern, sensitive headers including Authorization and Cookie are written to the logs in cleartext. An attacker who can read the log files can extract bearer tokens or session cookies and impersonate users. Upgrade to 26.5.6 or later. Note that the source also lists fixes in 26.4.11 and 26.6.0.

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
5.0 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0017, the 6th percentile, on 12 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.