GitHub Advisoryadvisory · Maven
GHSA-x4p7-7chp-64hq Keycloak: Unauthorized authentication via disabled SAML Identity Provider
HIGH
Official page ↗
- Aliases
- CVE-2026-2603
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-services, org.keycloak:keycloak-server-spi-private
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-306
- Reviewed
- 2026-03-18
Affected packages
• Maven org.keycloak:keycloak-services: < 26.5.5 → fixed in 26.5.5
• Maven org.keycloak:keycloak-server-spi-private: < 26.5.5 → fixed in 26.5.5
Description
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.
Related
Alias · CVE (1)
- CVE-2026-2603 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-306 Missing Authentication for Critical Functionality weakness
References
- 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