EIP-2026-105671

PRE-CVE

C99Shell (Web Shell) - 'c99.php' Authentication Bypass

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-105671. PoCs published by Mandat0ry.

AI-analyzed exploit summary This writeup details an authentication bypass vulnerability in C99.php shells due to a backdoor in the code. The exploit leverages a specific URL parameter to bypass authentication by manipulating the `$_REQUEST` variable extraction.

Description

C99Shell (Web Shell) - 'c99.php' Authentication Bypass

Exploits (1)

exploitdb WRITEUP
by Mandat0ry · textwebappsphp
https://www.exploit-db.com/exploits/34025

This writeup details an authentication bypass vulnerability in C99.php shells due to a backdoor in the code. The exploit leverages a specific URL parameter to bypass authentication by manipulating the `$_REQUEST` variable extraction.

Classification
Writeup 90%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: C99.php shells < 1.00 beta
No auth needed
Prerequisites: Access to a C99.php shell URL
mistral-large-3 · analyzed Feb 18, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026