CVEs-PoC/2021/CVE-2021-32733.md

### [CVE-2021-32733](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32733)
![](https://img.shields.io/static/v1?label=Product&message=security-advisories&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2019.0.13%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%2020.0.0%2C%20%3C%2020.0.11%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%2021.0.0%2C%20%3C%2021.0.3%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-79%3A%20Improper%20Neutralization%20of%20Input%20During%20Web%20Page%20Generation%20('Cross-site%20Scripting')&color=brightgreen)

### Description

Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a `text/html` Content-Type when serving files to users. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. As a workaround, use a browser that has support for Content-Security-Policy.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon