A flaw was found in Keycloak. Keycloak's Security Assertion Markup Language (SAML) broker endpoint does not properly validate encrypted assertions when the overall SAML response is not signed. An attacker with a valid signed SAML assertion can exploit this by crafting a malicious SAML response.
This allows the attacker to inject an encrypted assertion for an arbitrary principal, leading to unauthorized access and potential information disclosure.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://access.redhat.com/errata/RHSA-2026:3925
secalert@redhat.com
https://access.redhat.com/errata/RHSA-2026:3926
secalert@redhat.com
https://access.redhat.com/errata/RHSA-2026:3947
secalert@redhat.com
https://access.redhat.com/errata/RHSA-2026:3948
secalert@redhat.com
https://access.redhat.com/security/cve/CVE-2026-2092
secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2437296
secalert@redhat.com