cve/2023/CVE-2023-25403.md

### [CVE-2023-25403](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-25403)
![](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

CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.

### POC

#### Reference
- https://github.com/CleverStupidDog/yf-exam/issues/2

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