HIGH8.1
GHSA-x4p7-7chp-64hq
Keycloak: Unauthorized authentication via disabled SAML Identity Provider
Quick fix
GHSA-x4p7-7chp-64hq — org.keycloak:keycloak-services: upgrade to the fixed version with the command below.
# pom.xml: bump <version>26.5.5</version> for org.keycloak:keycloak-servicesDetails
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
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Affected packages
Maven/org.keycloak:keycloak-services
Introduced in:
0Fixed in: 26.5.5Fix
# pom.xml: bump <version>26.5.5</version> for org.keycloak:keycloak-servicesMaven/org.keycloak:keycloak-server-spi-private
Introduced in:
0Fixed in: 26.5.5Fix
# pom.xml: bump <version>26.5.5</version> for org.keycloak:keycloak-server-spi-privateReferences
- https://nvd.nist.gov/vuln/detail/CVE-2026-2603[ADVISORY]
- https://github.com/keycloak/keycloak/issues/46911[WEB]
- https://github.com/keycloak/keycloak/pull/46932[WEB]
- https://github.com/keycloak/keycloak/commit/4fd5367e6cc28cfa68fb2240fc459c12b1fdbf2a[WEB]
- https://github.com/keycloak/keycloak/commit/8ed7e59dc08d79751a27c23aadb590f06b43f132[WEB]
- https://access.redhat.com/errata/RHSA-2026:3925[WEB]
- https://access.redhat.com/errata/RHSA-2026:3926[WEB]
- https://access.redhat.com/errata/RHSA-2026:3947[WEB]
- https://access.redhat.com/errata/RHSA-2026:3948[WEB]
- https://access.redhat.com/security/cve/CVE-2026-2603[WEB]
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300[WEB]
- https://github.com/keycloak/keycloak[PACKAGE]
- https://github.com/keycloak/keycloak/commits/26.5.5[WEB]