CVE-2026-43513

Apache Tomcat: LockOutRealm treats user names as case-sensitive

State: Published
Severity: 7.5 High
Published: May 12, 2026
Updated: May 14, 2026
Reserved: May 1, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-178 Improper Handling of Case Sensitivity

Affected Products

Product	Versions
Apache TomcatApache Software Foundation	11.0.0-M1 through 11.0.21Affected 10.1.0-M1 through 10.1.54Affected 9.0.0.M1 through 9.0.117Affected 8.5.0 through 8.5.100Affected 7.0.0 through 7.0.109Affected before 7.00Unknown

References

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