Callback-url-file-3a-2f-2f-2fproc-2fself-2fenviron Upd -

The URL is: callback-url-file:///proc/self/environ

In the end, Emma's team successfully contained the breach, and they were hailed as heroes for their quick thinking and expertise. The mysterious callback URL had been cracked, and the security of the system had been restored. callback-url-file-3A-2F-2F-2Fproc-2Fself-2Fenviron

Decoded, it becomes: callback-url-file:///proc/self/environ Emma's team successfully contained the breach