CVE-2023-0264: Red Hat Keycloak

Medium severity, CVSS 5.0. EPSS: 1.3% chance of exploitation in the next 30 days.

A flaw was found in Keycloaks OpenID Connect user authentication, which may incorrectly authenticate requests. An authenticated attacker who could obtain information from a user request within the same realm could use that data to impersonate the victim and generate new session tokens. This issue could impact confidentiality, integrity, and availability.

Affected products

• Red Hat Keycloak: before 18.0.6 (fixed in 18.0.6)
• Red Hat Openshift Container Platform: version 4.9 only; version 4.10 only
• Red Hat Openshift Container Platform For IBM Linuxone: 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 7.6.2 (fixed in 7.6.2); affected versions not specified

Published 2023-08-04. Last modified 2026-06-17.