Improper Authorization Vulnerability in Apache Tomcat by Apache
CVE-2026-43515

9.1CRITICAL

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
12 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-43515?

An improper authorization vulnerability has been identified in Apache Tomcat, where multiple method constraints may define an HTTP method for the same extension. This flaw can potentially allow unauthorized access and manipulation of resources within the affected versions of Apache Tomcat, making it imperative for users running vulnerable releases to upgrade to the patched versions 11.0.22, 10.1.55, or 9.0.118 to mitigate this risk.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.21

Apache Tomcat 10.1.0-M1 <= 10.1.54

Apache Tomcat 9.0.0.M1 <= 9.0.117

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cve-2026-43515-poc
Created by covepseng

References

https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkg...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.