Concrete5 version 8.5.4 suffers from a persistent cross site scripting vulnerability. Original discovery of persistent cross site scripting in this version is attributed to nu11secur1ty in March of 2021.
355e3f299bb2c3071c20327fb0ee81ea# Exploit Title: Concrete5 8.5.4 - 'name' Stored XSS
# Date: 2021-01
# Exploit Author: Quadron Research Lab
# Version: Concrete5 8.5.4
# Tested on: Windows 10 x64 HUN/ENG Professional
# Vendor: Concrete5 CMS (https://www.concrete5.org)
# CVE: CVE-2021-3111
[Suggested description]
The Express Entries Dashboard inConcrete5 8.5.4 allows stored XSS via the name field of a new data object at anindex.php/dashboard/express/entries/view/ URI.
[Attack Vectors]
Creating a new data object, the name field is not filtered. It is possible to place JavaScript code. [Stored XSS]
Proof of Concept
https://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdf