Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability

Advisories

severity: high
date: December 15, 2025
Affecting: Member Login Script 3.3
CVE: CVE-2023-53878
CWE: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS: 7.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
References: ExploitDB-51710
Product Webpage
Credit: nu11secur1ty
Description: Member Login Script 3.3 contains a client-side desynchronization vulnerability that allows attackers to manipulate HTTP request handling by exploiting Content-Length header parsing. Attackers can send crafted POST requests with smuggled secondary requests to potentially bypass server-side request processing controls.