CVE-2026-55956
Apache Tomcat: Security constraints for default servlet ignored method
Description
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 through 11.0.22, from 10.1.0 through 10.1.55, from 9.0.0 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.
How to fix CVE-2026-55956
To remediate CVE-2026-55956, upgrade the affected package to a fixed version below.
- —upgrade to 9.0.119 or later
Is CVE-2026-55956 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 9.0.119, >= 10.1.0, < 10.1.56, >= 11.0.0, < 11.0.23
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |