CVE-2023-44764: GitHub - sromanhu/ConcreteCMS-Stored-XSS---Site_Installation: Cross Site Scripting vulnerability in ConcreteCMS v.9.2.1 allows a local attacker to execute arbitrary code via a crafted script to the SI

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 SITE parameter from installation or in the Settings.

Attack Vectors: Scripting A vulnerability in the sanitization of the entry in the Site of Installation or Settings allows injecting JavaScript code that will be executed when the user accesses the web page.

POC:

In the installation process we add the payload in the SITE parameter:

XSS Payload:

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

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/