CVE-2020-27826: Red Hat Keycloak

Medium severity, CVSS 4.2. EPSS: 0.6% chance of exploitation in the next 30 days.

A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.

Affected products

• Red Hat Keycloak: before 12.0.0 (fixed in 12.0.0)
• Red Hat Single Sign-On: affected versions not specified; version 7.4 only; version 7.4.4 only

Published 2021-05-28. Last modified 2026-06-17.