### [CVE-2021-27889](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27889)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.

### POC

#### Reference
- http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/SexyBeast233/SecBooks
- https://github.com/SouthWind0/southwind0.github.io
- https://github.com/scannells/exploits
- https://github.com/xiaopan233/Mybb-XSS_SQL_RCE-POC