CVE-2026-43515— Apache Tomcat: Security constraints not correctly applied
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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-2026-43515
Vulnerability Information
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Vulnerability Title
Apache Tomcat: Security constraints not correctly applied
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension 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. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache Tomcat 授权问题漏洞
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版本存在授权问题漏洞，该漏洞源于多个方法约束为同一扩展定义HTTP方法时授权不当。
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-2026-43515
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-43513 | Apache Tomcat: LockOutRealm treats user names as case-sensitive | |
| CVE-2026-43514 | Apache Tomcat: AJP secret compared in non-constant time |
IV. Related Vulnerabilities
Same product: Apache Tomcat
- CVE-2026-43514
Apache Tomcat: AJP secret compared in non-constant time - CVE-2026-43513
Apache Tomcat: LockOutRealm treats user names as case-sensit - CVE-2026-43512
Apache Tomcat: Digest authenticator will authenticate any un - CVE-2026-41293
Apache Tomcat: HTTP/2 request headers not validated - CVE-2026-42498
Apache Tomcat: WebSocket authentication header exposure
Same vendor: Apache Software Foundation
- CVE-2026-35194
Apache Flink: Remote code execution via SQL injection in cod - CVE-2026-45205
Apache Commons Configuration: StackOverflowError for YAML in - CVE-2026-43514
Apache Tomcat: AJP secret compared in non-constant time - CVE-2026-43513
Apache Tomcat: LockOutRealm treats user names as case-sensit - CVE-2026-43512
Apache Tomcat: Digest authenticator will authenticate any un
Same weakness: CWE-285
- CVE-2026-45345
Open WebUI: Missing authorization check at the model update - CVE-2026-45365
Open WebUI: Authenticated users can bypass model access cont - CVE-2026-45147
SiYuan: Broken access control in SiYuan `/api/tag/getTag` — - CVE-2026-45371
SiYuan: SiYuan publish-mode Reader can mutate Conf and SQL i - CVE-2026-44504
Aegra: Cross-user run injection in /threads/{thread_id}/runs
V. Comments for CVE-2026-43515
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