CVE-2026-43513CWE-178

Apache Tomcat: LockOutRealm treats user names as case-sensitive

High · published May 12, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
42.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00503 · 42.1th percentile
Weakness
CWE-178 · Improper Handling of Case Sensitivity
Published
2026-05-12T15:26Z
EPSS history
Timeline
  • 12 MAY 15:26Z
    Apache Tomcat: LockOutRealm treats user names as case-sensitive
    cvelistv5