CVE-2025-1391: Red Hat Build Of Keycloak

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in the Keycloak organization feature, which allows the incorrect assignment of an organization to a user if their username or email matches the organization’s domain pattern. This issue occurs at the mapper level, leading to misrepresentation in tokens. If an application relies on these claims for authorization, it may incorrectly assume a user belongs to an organization they are not a member of, potentially granting unauthorized access or privileges.

Affected products

• Red Hat Red Hat Build Of Keycloak
• Red Hat Red Hat Build Of Keycloak 26.0: before 26.0.10-3 (fixed in 26.0.10-3); before 26.0-11 (fixed in 26.0-11); before 26.0-12 (fixed in 26.0-12)

Published 2025-02-17. Last modified 2026-09-21.