Apache Tomcat: Security constraint bypass for pre/post-resources

Summary

Authentication Bypass Using an Alternate Path or Channel vulnerability in Apache Tomcat.  When using PreResources or PostResources mounted other than at the root of the web application, it was possible to access those resources via an unexpected path. That path was likely not to be protected by the same security constraints as the expected path, allowing those security constraints to be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.7, from 10.1.0-M1 through 10.1.41, from 9.0.0.M1 through 9.0.105. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.8, 10.1.42 or 9.0.106, which fix the issue.

Timeline

1. Jun 16, 2025, 2:18 PM UTCCVE published
2. Jun 17, 2025, 2:06 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Nov 3, 2025, 8:05 PM UTCRecord last updated

Affected versions

• Apache Software Foundation Apache Tomcat

  From 11.0.0-M1 · through 11.0.7; From 10.1.0-M1 · through 10.1.41; From 9.0.0.M1 · through 9.0.105; From 8.5.0 · through 8.5.100

• org.apache.tomcat:tomcat-catalinaMaven

  From 11.0.0-M1 · fixed in 11.0.8

• org.apache.tomcat:tomcat-catalinaMaven

  From 10.1.0-M1 · fixed in 10.1.42

• org.apache.tomcat:tomcat-catalinaMaven

  From 9.0.0.M1 · fixed in 9.0.106

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 11.0.0-M1 · fixed in 11.0.8

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 10.1.0-M1 · fixed in 10.1.42

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 9.0.0.M1 · fixed in 9.0.106

• org.apache.tomcat:tomcat-catalinaMaven

  From 8.5.0 · through 8.5.100

• org.apache.tomcat.embed:tomcat-embed-coreMaven

  From 8.5.0 · through 8.5.100

References 2