# Eval() in Ruby



```ruby
# Add a " (double-quote) at the end and you will see an error.

https://ptl-3d9b6ba3-e492b0d5.libcurl.so/?username="
https://ptl-3d9b6ba3-e492b0d5.libcurl.so/?username=iptracej"
```

<figure><img src="https://4082237222-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FnA4bAkddGXesk1QCLYAY%2Fuploads%2Fd8Jil394drYe8Fepr85D%2Fimage.png?alt=media&#x26;token=23fcf76f-2780-4829-98bf-6faa2a909dd2" alt=""><figcaption></figcaption></figure>

```bash
# Add the following payload: 
# "+`id`+" 

https://<URL>/?username="%2b`id`%2b"
```
