Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:3925
- https://access.redhat.com/errata/RHSA-2026:3926
- https://access.redhat.com/errata/RHSA-2026:3947
- https://access.redhat.com/errata/RHSA-2026:3948
- https://access.redhat.com/security/cve/CVE-2026-2603
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300
FAQ
What is CVE-2026-2603?
CVE-2026-2603 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-2603?
CVE-2026-2603 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-2603?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.