CVE-2026-55956
Published:June 29, 2026
Updated:July 21, 2026
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 Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0 <11.0.23Fix Suggestion:
Update to version 11.0.23https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.0 <10.1.56Fix Suggestion:
Update to version 10.1.56https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.0 <9.0.119Fix Suggestion:
Update to version 9.0.119org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=10.1.0 <10.1.56Fix Suggestion:
Update to version 10.1.56org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=9.0.1 <9.0.119Fix Suggestion:
Update to version 9.0.119org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=11.0.0 <11.0.23Fix Suggestion:
Update to version 11.0.23Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Authorization
EPSS
Base Score:
0.41