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Concrete5 8.5.4 Cross Site Scripting

Concrete5 8.5.4 Cross Site Scripting
Posted Mar 29, 2021
Authored by Quadron Research Lab

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.

tags | exploit, xss
advisories | CVE-2021-3111
SHA-256 | 85b90184d4fc5f1bb1bad2e1800e72fd5f21249b52f09b95dfbc02fe3864fd2d

Concrete5 8.5.4 Cross Site Scripting

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# 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

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