CVE-2020-27838: Red Hat Keycloak

Medium severity, CVSS 6.5. EPSS: 17.9% chance of exploitation in the next 30 days.

A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

Affected products

• Red Hat Keycloak: before 13.0.0 (fixed in 13.0.0)
• Red Hat Single Sign-On: version 7.0 only

Published 2021-03-08. Last modified 2026-06-17.