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.
Published: 2026-05-12
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Fri, 15 May 2026 16:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

Thu, 14 May 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}


Tue, 12 May 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache tomcat
Vendors & Products Apache
Apache tomcat

Tue, 12 May 2026 18:30:00 +0000

Type Values Removed Values Added
References

Tue, 12 May 2026 16:00:00 +0000

Type Values Removed Values Added
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.
Title Apache Tomcat: LockOutRealm treats user names as case-sensitive
Weaknesses CWE-178
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-05-14T19:53:30.781Z

Reserved: 2026-05-01T16:21:04.703Z

Link: CVE-2026-43513

cve-icon Vulnrichment

Updated: 2026-05-12T17:41:00.529Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-12T16:16:18.177

Modified: 2026-05-15T15:53:14.517

Link: CVE-2026-43513

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T22:00:10Z

Weaknesses