CVE-2026-37981: Red Hat Build Of Keycloak

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access (UMA) resource, to enumerate and harvest personally identifiable information (PII) for all realm users. By sending crafted requests with arbitrary usernames or email values, the endpoint returns full profile objects for unrelated users. This leads to broad profile-level information disclosure.

Affected products

• Red Hat Build Of Keycloak: from 26.4, before 26.4.12 (fixed in 26.4.12)

Published 2026-05-19. Last modified 2026-06-17.