CVEs-PoC/2021/CVE-2021-23384.md

### [CVE-2021-23384](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23384)
![](https://img.shields.io/static/v1?label=Product&message=koa-remove-trailing-slashes&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%202.0.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Open%20Redirect&color=brighgreen)

### Description

The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as https://example.com//attacker.example/). The vulnerable code is in index.js::removeTrailingSlashes(), as the web server uses relative URLs instead of absolute URLs.

### POC

#### Reference
- https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708

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