CVE-2023-44766: GitHub - sromanhu/ConcreteCMS-Stored-XSS---SEO: Cross Site Scripting vulnerability in ConcreteCMS v.9.2.1 allows a local attacker to execute arbitrary code via a crafted script to the SEO - Header Ext

ConcreteCMS Stored XSS v.9.2.1****Author: (Sergio)

Description: Cross Site Scripting vulnerability in ConcreteCMS v.9.2.1 allows a local attacker to execute arbitrary code via a crafted script to the SEO - Extra from Page Settings.

Attack Vectors: Scripting A vulnerability in the sanitization of the entry in the “Header Extra Content” of “SEO” allows injecting JavaScript code that will be executed when the user accesses the web page.

POC:

When logging into the panel, we will go to the "Page Settings - SEO".

XSS Payload:

<img src=x:alert(alt) onerror=eval(src) alt=’XSS Extra

In the following image you can see the embedded code that executes the payload in the main web.

Additional Information:

https://www.concretecms.com/

https://owasp.org/Top10/es/A03_2021-Injection/