CVEs-PoC/2021/CVE-2021-27340.md

### [CVE-2021-27340](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27340)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brightgreen)

### Description

OpenSIS Community Edition version <= 7.6 is affected by a reflected XSS vulnerability in EmailCheck.php via the "opt" parameter.

### POC

#### Reference
- https://github.com/OS4ED/openSIS-Classic/commit/f78407d5291c686c3f416073dcb9143f3a3d5489#diff-24b751f2072f058259d033016938101f9fa29884ebcc09ce7eb88def3421e5ba
- https://github.com/OS4ED/openSIS-Classic/issues/158
- https://github.com/OS4ED/openSIS-Classic/releases

#### Github
- https://github.com/20142995/nuclei-templates
- https://github.com/cyb3r-w0lf/nuclei-template-collection