CVE-2026-43513

HIGH

Apache Tomcat: LockOutRealm treats user names as case-sensitive

Title source: cna
STIX 2.1

Description

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.

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0008
EPSS Percentile 23.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-178
Status published
Products (16)
apache/tomcat 7.0.0 - 7.0.109
Apache Software Foundation/Apache Tomcat < 7.00
Apache Software Foundation/Apache Tomcat 10.1.0-M1 - 10.1.54
Apache Software Foundation/Apache Tomcat 11.0.0-M1 - 11.0.21
Apache Software Foundation/Apache Tomcat 7.0.0 - 7.0.109
Apache Software Foundation/Apache Tomcat 8.5.0 - 8.5.100
Apache Software Foundation/Apache Tomcat 9.0.0.M1 - 9.0.117
org.apache.tomcat/tomcat 0 - 9.0.118Maven
org.apache.tomcat/tomcat 10.1.0-M1 - 10.1.55Maven
org.apache.tomcat/tomcat 11.0.0-M1 - 11.0.22Maven
... and 6 more
Published May 12, 2026
Tracked Since May 12, 2026