CMSimple 5.2 XSS漏洞

INFO

1. Exploit Title: CMSimple 5.2 - 'External' Stored XSS
2. Date: 2021/04/07
3. Exploit Author: Quadron Research Lab
4. Version: CMSimple 5.2
5. Tested on: Windows 10 x64 HUN/ENG Professional
6. Vendor: https://www.cmsimple.org/en/

[Description] The CMSimple 5.2 allow stored XSS via the Settings > CMS > Filebrowser > "External:" input field.

[Attack Vectors] The CMSimple cms "Filebrowser" "External:" input field not filter special chars. It is possible to place JavaScript code. The JavaScript code placed here is executed by clicking on the Page or Files tab.

[Proof of Concept] https://github.com/Quadron-Research-Lab/CVE/blob/main/CMSimple_5.2_XSS.pdf