CVE-2021-3424: Red Hat Single Sign-On

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible. A malicious user can register himself with a name already registered and trick admin to grant him extra privileges.

Affected products

• Red Hat Single Sign-On: version 7.4 only

Published 2021-06-01. Last modified 2026-06-17.