### [CVE-2021-39338](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39338)
![](https://img.shields.io/static/v1?label=Product&message=MyBB%20Cross-Poster&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=1.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-79%20Cross-site%20Scripting%20(XSS)&color=brightgreen)

### Description

The MyBB Cross-Poster WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/classes/MyBBXPSettings.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 1.0. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/20142995/nuclei-templates