### [CVE-2017-9781](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9781)
![](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

A cross site scripting (XSS) vulnerability exists in Check_MK versions 1.4.0x prior to 1.4.0p6, allowing an unauthenticated remote attacker to inject arbitrary HTML or JavaScript via the _username parameter when attempting authentication to webapi.py, which is returned unencoded with content type text/html.

### POC

#### Reference
- https://www.tenable.com/security/research/tra-2017-21

#### Github
No PoCs found on GitHub currently.