CMSimple 5.2 Stored Cross-Site Scripting via Filebrowser External Input

Advisories

severity: medium
date: December 23, 2025
Affecting: CMSimple 5.2
CVE: CVE-2021-47732
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 5.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: ExploitDB-49751
Official CMSimple Vendor Homepage
Credit: Quadron Research Lab
Description: CMSimple 5.2 contains a stored cross-site scripting vulnerability in the Filebrowser External input field that allows attackers to inject malicious JavaScript. Attackers can place unfiltered JavaScript code that executes when users click on Page or Files tabs, enabling persistent script injection.