Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected
Description: When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null".
Mitigation: Users of the affected versions should apply one of the following mitigations:
{
"cwe_ids": [
"CWE-287"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-18T20:38:27Z",
"nvd_published_at": "2026-05-12T16:16:17Z",
"severity": "CRITICAL"
}