CVE-2026-55956: Apache Tomcat

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

Affected products

• Apache Tomcat: before 9.0.119 (fixed in 9.0.119); from 10.1.0, before 10.1.56 (fixed in 10.1.56); from 11.0.0, before 11.0.23 (fixed in 11.0.23)

Published 2026-06-29. Last modified 2026-07-02.