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CMSimple 5.2 - 'External' Stored XSS

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# Exploit Title: CMSimple 5.2 - 'External' Stored XSS
# Date: 2021/04/07
# Exploit Author: Quadron Research Lab
# Version: CMSimple 5.2
# Tested on: Windows 10 x64 HUN/ENG Professional
# 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
            
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