EIP-2026-103851

PRE-CVE

Apache Tomcat - Form Authentication 'Username' Enumeration

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103851. PoCs published by D. Matscheko.

AI-analyzed exploit summary This exploit demonstrates an authentication bypass vulnerability in Tomcat by sending a malformed POST request to the `/j_security_check` endpoint. The payload uses a percentage sign in the password field to bypass authentication.

Description

Apache Tomcat - Form Authentication 'Username' Enumeration

Exploits (1)

exploitdb WORKING POC VERIFIED
by D. Matscheko · textremotemultiple
https://www.exploit-db.com/exploits/9995

This exploit demonstrates an authentication bypass vulnerability in Tomcat by sending a malformed POST request to the `/j_security_check` endpoint. The payload uses a percentage sign in the password field to bypass authentication.

Classification
Working Poc 80%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: Apache Tomcat (version not specified)
No auth needed
Prerequisites: Access to the Tomcat login endpoint
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026