CVE-2026-1190: Red Hat Build Of Keycloak 26.4

Low severity, CVSS 3.1. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.

Affected products

• Red Hat Red Hat Build Of Keycloak 26.4: before 26.4.10-1 (fixed in 26.4.10-1); before 26.4-12 (fixed in 26.4-12)
• Red Hat Red Hat Build Of Keycloak 26.4.10
• Red Hat Red Hat JBoss Enterprise Application Platform 8
• Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
• Red Hat Red Hat Single Sign-On 7

Published 2026-01-26. Last modified 2026-06-17.