CVE-2026-55956: Apache Tomcat: Security constraints for default servlet ignored method
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 11.0.23 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 10.1.56 - Upgrade
Upgrade
Apache Tomcatto a version that resolves this vulnerability.Fixed in 9.0.119
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55956?
CVE-2026-55956 has a risk rating of 30, indicating a significant security concern.
How do I fix CVE-2026-55956?
To fix CVE-2026-55956, upgrade your Apache Tomcat to a version that is not affected, specifically to versions after 11.0.22, 10.1.55, or 9.x versions that have been patched.
What are the impacts of CVE-2026-55956?
CVE-2026-55956 could allow unauthorized access to resources due to ignored security constraints for the default servlet.
Which versions of Apache Tomcat are affected by CVE-2026-55956?
CVE-2026-55956 affects Apache Tomcat versions from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, and some 9.x versions.
Is CVE-2026-55956 related to improper authorization?
Yes, CVE-2026-55956 is an improper authorization vulnerability that allows security constraints set for the default servlet to be ignored.