High · published August 26, 2026
Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPNEGO) that a user would be authenticated even if the user did not exist in the DataSourceRealm.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
| Product | Versions | Fixed in |
|---|---|---|
| apache/tomcat | ≥ 7.0.0, ≤ 7.0.109 | — |
| apache/tomcat | ≥ 8.5.0, < 9.0.121 | 9.0.121 |
| apache/tomcat | ≥ 10.1.0, < 10.1.58 | 10.1.58 |
| apache/tomcat | ≥ 11.0.0, < 11.0.25 | 11.0.25 |