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Advisory record · GHSA-fqjh-8322-vgrv

Keycloak Generates an Error Message Containing Sensitive Information

CVSS 5.3 MediumEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 28 May 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<=26.4.7 || >=26.5.0, <26.6.326.6.3
Identifiers
GHSA-fqjh-8322-vgrv · CVE-2026-9794
Weakness (CWE)
CWE-209
Tags
Published
28 May 2026
Updated
1 Jul 2026

Machine-written summary

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

Keycloak keycloak-services versions up to and including 26.4.7, and versions from 26.5.0 before 26.6.3, are affected. A remote, unauthenticated attacker can send specially crafted SOAP requests with varying client IDs to the SAML ECP endpoint and read the differing error messages to learn a client's protocol type. Upgrade to version 26.6.3 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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (redhat)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.