Description
A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected products
- RedHat / build_of_keycloak26.4 – 26.4.14
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50846
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50847
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50848
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50849
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-16443
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2503139
Updated 8m ago · 8 sources