Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-x4p7-7chp-64hq

Keycloak: Unauthorized authentication via disabled SAML Identity Provider

CVSS 8.1 HighEPSS 0.0045 · 39th percentile

Published by the GitHub Advisory Database at 18 Mar 2026, 03:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.keycloak:keycloak-servicesMaven<26.5.526.5.5
org.keycloak:keycloak-server-spi-privateMaven<26.5.526.5.5
Identifiers
GHSA-x4p7-7chp-64hq · BIT-keycloak-2026-2603 · CVE-2026-2603
Weakness (CWE)
CWE-306
Tags
Published
18 Mar 2026
Updated
26 Aug 2026

Machine-written summary

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

Keycloak versions before 26.5.5, as packaged in keycloak-services and keycloak-server-spi-private, can be bypassed. A remote attacker who sends a valid SAML response from an external Identity Provider to the SAML endpoint for IdP-initiated broker logins can complete a login even when that SAML Identity Provider is disabled, gaining unauthorized authentication. Upgrade to version 26.5.5 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
8.1 High 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.