Trapped Source

We are given this website:

It looks like a panel where we must enter a PIN.

Inspecting HTML code

If we press Ctrl-U on the keyboard, we will see the HTML code of the website:

Surprise! The expected pin is there in clear text: 1425. Let’s put it:

Flag

And there’s the flag:

HTB{vi3w_cli13nt_s0urc3_S3cr3ts!}