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CVE-2026-43513— Apache Tomcat: LockOutRealm treats user names as case-sensitive

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 11.0.0-M1至11.0.21版本、10.1.0-M1至10.1.54版本、9.0.0.M1至9.0.117版本、8.5.0至8.5.100版本和7.0.0至7.0.109版本存在安全漏洞，该漏洞源于LockOutRealm中大小写敏感性处理不当。

AI Predicted 5.3 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.21 affected
10.1.0-M1≤ 10.1.54 affected
9.0.0.M1≤ 9.0.117 affected
8.5.0≤ 8.5.100 affected
7.0.0≤ 7.0.109 affected
< 7.00 unknown
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I. Basic Information for CVE-2026-43513

Vulnerability Information
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Vulnerability Title
Apache Tomcat: LockOutRealm treats user names as case-sensitive
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 11.0.0-M1至11.0.21版本、10.1.0-M1至10.1.54版本、9.0.0.M1至9.0.117版本、8.5.0至8.5.100版本和7.0.0至7.0.109版本存在安全漏洞，该漏洞源于LockOutRealm中大小写敏感性处理不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.21 -

II. Public POCs for CVE-2026-43513

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III. Intelligence Information for CVE-2026-43513

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Mailing List Discussions for CVE-2026-43513 (1)

Same Patch Batch · Apache Software Foundation · 2026-05-12 · 7 CVEs total

CVE-2026-41284 Apache Tomcat: Unbounded read in WebDAV LOCK and PROPFIND handling
CVE-2026-42498 Apache Tomcat: WebSocket authentication header exposure
CVE-2026-41293 Apache Tomcat: HTTP/2 request headers not validated
CVE-2026-43512 Apache Tomcat: Digest authenticator will authenticate any unknown user
CVE-2026-43514 Apache Tomcat: AJP secret compared in non-constant time
CVE-2026-43515 Apache Tomcat: Security constraints not correctly applied

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-178

V. Comments for CVE-2026-43513

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