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 breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected products
- RedHat / build_of_keycloak26.2 – 26.2.14
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3925
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3926
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3947
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3948
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-2603
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2440300
Updated 8m ago · 8 sources