CVE-2023-6134: Red Hat Keycloak

Medium severity, CVSS 5.4. EPSS: 1.3% chance of exploitation in the next 30 days.

A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748.

Affected products

• Red Hat Keycloak: before 22.0.7 (fixed in 22.0.7)
• Red Hat Openshift Container Platform: version 4.11 only; version 4.12 only
• Red Hat Openshift Container Platform For Power: version 4.9 only; version 4.10 only
• Red Hat Openshift Container Platform IBM Z Systems: version 4.9 only; version 4.10 only
• Red Hat Single Sign-On: before 7.6 (fixed in 7.6); affected versions not specified

Published 2023-12-14. Last modified 2026-09-22.