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CVE-2026-43513GHSA-5MP6-JRQ3-R938BIT-TOMCAT-2026-43513

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Published
Last modified
published
Not listed in CISA KEV
Low (apache)
Fix
Fixed in 9.0.118, 10.1.55, 11.0.22
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

Improper Handling of Case Sensitivity vulnerability in LockOutRealm in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Apache Software Foundation Apache Tomcat

    From 11.0.0-M1 · through 11.0.21; From 10.1.0-M1 · through 10.1.54; From 9.0.0.M1 · through 9.0.117; From 8.5.0 · through 8.5.100; From 7.0.0 · through 7.0.109

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

    fixed in 9.0.118

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

    From 10.1.0-M1 · fixed in 10.1.55

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

    From 11.0.0-M1 · fixed in 11.0.22

  • org.apache.tomcat:tomcatMaven

    fixed in 9.0.118

  • org.apache.tomcat:tomcatMaven

    From 10.1.0-M1 · fixed in 10.1.55

  • org.apache.tomcat:tomcatMaven

    From 11.0.0-M1 · fixed in 11.0.22

  • org.apache.tomcat:tomcat-catalinaMaven

    fixed in 9.0.118

  • org.apache.tomcat:tomcat-catalinaMaven

    From 10.1.0-M1 · fixed in 10.1.55

  • org.apache.tomcat:tomcat-catalinaMaven

    From 11.0.0-M1 · fixed in 11.0.22

References 1

lists.apache.org