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pentesting-web/hacking-jwt-json-web-tokens.md
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# JWT Vulnerabilities \(Json Web Tokens\) # JWT Vulnerabilities \(Json Web Tokens\)
**Part of this post was taken from:** [**https://github.com/ticarpi/jwt\_tool/wiki/Attack-Methodology**](https://github.com/ticarpi/jwt_tool/wiki/Attack-Methodology) **Part of this post was taken from:** [**https://github.com/ticarpi/jwt\_tool/wiki/Attack-Methodology**](https://github.com/ticarpi/jwt_tool/wiki/Attack-Methodology)
**Author of the great tool to pentest JWT** [**https://github.com/ticarpi/jwt\_tool**](https://github.com/ticarpi/jwt_tool)\*\*\*\* **Author of the great tool to pentest JWTs** [**https://github.com/ticarpi/jwt\_tool**](https://github.com/ticarpi/jwt_tool)
## **Quick Wins**
Run [**jwt\_tool**](https://github.com/ticarpi/jwt_tool) ****with mode `All Tests!` and wait for green lines
```bash
python3 jwt_tool.py -M at -t "https://api.example.com/api/v1/user/76bab5dd-9307-ab04-8123-fda81234245" -rh "Authorization: Bearer eyJhbG...<JWT Token>"
```
If you are lucky the tool will find some case where the web application is correctly checking the JWT:
![](../.gitbook/assets/image%20%28435%29.png)
Then, you can search the request in your proxy or dump the used JWT for that request using jwt\_ tool:
```bash
python3 jwt_tool.py -Q "jwttool_706649b802c9f5e41052062a3787b291"
```
## Tamper data without modifying anything ## Tamper data without modifying anything