1. Home
  2. CVE Database
  3. CVE-2026-2603
HIGH · 8.1

CVE-2026-2603

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...

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

8.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE

Affected Products

VendorProductVersions
RedhatBuild Of Keycloak>= 26.2, < 26.2.14

Related Weaknesses (CWE)

CWE-306

References

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. Affected products include: Redhat Build Of Keycloak.