cve/2021/CVE-2021-42136.md

### [CVE-2021-42136](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42136)
![](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 stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes functionality of REDCap before 11.4.0 allows remote attackers to execute JavaScript code in the client's browser by storing said code as a Missing Data Code value. This can then be leveraged to execute a Cross-Site Request Forgery attack to escalate privileges to administrator.

### POC

#### Reference
- http://packetstormsecurity.com/files/166723/REDCap-Cross-Site-Scripting.html

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