Cross-site Scripting (XSS) - Reflected in GitHub repository flatpressblog/flatpress prior to 1.3.
https://huntr.dev/bounties/1288ec00-f69d-4b84-abce-efc9a97941a0
https://github.com/flatpressblog/flatpress/commit/5f23b4c2eac294cc0ba5e541f83a6f8a26f9fed1