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Apache Tomcat: LockOutRealm treats user names as case-sensitive

🗓️ 12 May 2026 18:30:38Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 12 Views

LockOutRealm in Apache Tomcat is case sensitive; several versions are affected; upgrade to fixed releases.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
Tenable Nessus		Amazon Linux 2023 : tomcat9, tomcat9-admin-webapps, tomcat9-el-3.0-api (ALAS2023-2026-1770)
8 Jun 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : tomcat10, tomcat10-admin-webapps, tomcat10-el-5.0-api (ALAS2023-2026-1776)
8 Jun 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : tomcat, --advisory ALAS2TOMCAT9-2026-026 (ALASTOMCAT9-2026-026)
8 Jun 202600:00
–nessus
Tenable Nessus		Debian dla-4619 : libtomcat9-embed-java - security update
6 Jun 202600:00
–nessus
Tenable Nessus		Debian dsa-6328 : libtomcat10-embed-java - security update
8 Jun 202600:00
–nessus
Tenable Nessus		Debian dsa-6329 : libtomcat11-embed-java - security update
8 Jun 202600:00
–nessus
Tenable Nessus		SUSE SLES12 Security Update : tomcat (SUSE-SU-2026:2299-1)
14 Jun 202600:00
–nessus
Tenable Nessus		SUSE SLES15 Security Update : tomcat11 (SUSE-SU-2026:2374-1)
14 Jun 202600:00
–nessus
Tenable Nessus		SUSE SLES15 Security Update : tomcat10 (SUSE-SU-2026:2377-1)
14 Jun 202600:00
–nessus
Tenable Nessus		Apache Tomcat 10.1.0.M1 < 10.1.55 multiple vulnerabilities
12 May 202600:00
–nessus
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Vulners
Node
org.apache.tomcattomcat-catalinaRange11.0.0-M1–11.0.22maven
OR
org.apache.tomcattomcat-catalinaRange10.1.0-M1–10.1.55maven
OR
org.apache.tomcattomcat-catalinaRange<9.0.118maven
OR
org.apache.tomcattomcatRange11.0.0-M1–11.0.22maven
OR
org.apache.tomcattomcatRange10.1.0-M1–10.1.55maven
OR
org.apache.tomcattomcatRange<9.0.118maven
OR
org.apache.tomcat.embedtomcat-embed-coreRange11.0.0-M1–11.0.22maven
OR
org.apache.tomcat.embedtomcat-embed-coreRange10.1.0-M1–10.1.55maven
OR
org.apache.tomcat.embedtomcat-embed-coreRange<9.0.118maven

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18 May 2026 20:31Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.5
EPSS0.00121
SSVC
CWE-178
LockOutRealmcase sensitivevulnerabilityApache Tomcataffected versionsupgrades
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