CVE-2021-3827: Red Hat Keycloak

Medium severity, CVSS 6.8. EPSS: 1.1% chance of exploitation in the next 30 days.

A flaw was found in keycloak, where the default ECP binding flow allows other authentication flows to be bypassed. By exploiting this behavior, an attacker can bypass the MFA authentication by sending a SOAP request with an AuthnRequest and Authorization header with the user's credentials. The highest threat from this vulnerability is to confidentiality and integrity.

Affected products

• Red Hat Keycloak: before 18.0.0 (fixed in 18.0.0)
• Red Hat Openshift Container Platform: version 4.8 only; version 4.9 only
• Red Hat Single Sign-On: version 7.0 only; version 7.5.0 only

Published 2022-08-23. Last modified 2026-06-17.