High

Keycloak SAML Broken has Authentication Bypass by Primary Weakness

Disclosed: 05.03.2026
Updated: 11.10.2026 12:22

A flaw was found in org.keycloak.broker.saml. When a disabled Security Assertion Markup Language (SAML) client is configured as an Identity Provider (IdP)-initiated broker landing target, it can still complete the login process and establish a Single Sign-On (SSO) session. This allows a remote attacker to gain unauthorized access to other enabled clients without re-authentication, effectively bypassing security restrictions.

A fix is available at https://github.com/keycloak/keycloak/releases/tag/26.5.5.

Affected software

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Platform	Package	Vulnerable versions	Fixed in
Java / Kotlin (Maven)	org.keycloak:keycloak-broker-saml	<= 1.8.1.Final	no fix

References

CVSS score 8.8/10

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-305
Platform: Java / Kotlin (Maven)
Package: org.keycloak:keycloak-broker-saml
Disclosed: 05.03.2026
Updated: 11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-8cr3-vpxx-92cx - CC BY 4.0

Vulnerability history: org.keycloak:keycloak-broker-saml

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

This is the only known vulnerability of this package.

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