CVE-2026-68569

A flaw was found in Apache Tomcat. This improper authentication vulnerability allows a remote attacker to be authenticated even if their user account does not exist in the DataSourceRealm, under specific circumstances such as CLIENT-CERT or SPNEGO authentication. This can lead to unauthorized access to the system.

This Important vulnerability in Apache Tomcat allows unauthorized access when configured with CLIENT-CERT or SPNEGO authentication alongside a DataSourceRealm. This flaw could permit a user to be authenticated even if their account does not exist, bypassing intended security controls in Red Hat deployments where these specific configurations are in use.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, avoid using CLIENT-CERT or SPNEGO authentication methods with the DataSourceRealm in Apache Tomcat. Alternatively, restrict network access to the Apache Tomcat instance to trusted clients only, thereby limiting exposure to potential attackers. If changes are made to the Tomcat configuration, a service restart may be required for the changes to take effect.