working exploit for the old cve-2021-21425 grav cms 1.7.10 vuln
### Exploit for: GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated)
##### Usage:
```sh
python3 exploit.py --url http://192.168.204.12/grav-admin
```
Expected behaviour

Do not use this exploit on systems you are not authorized!
Happy hacking.
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