Postbook - FLAG4

0x00 Edit Post

http://127.0.0.1/1234567890/index.php?page=edit.php&id=3

0x01 Edit Others Post

The id seems can be change.

http://127.0.0.1/1234567890/index.php?page=edit.php&id=1

0x02 FLAG

Save the edit result. Get the flag.