A vulnerability exists in phpBB <v3.2.10 and <v3.3.1 which allowed remote image dimensions check to be used to SSRF.
https://github.com/advisories/GHSA-jhm9-h84h-rw83
https://www.phpbb.com/community/viewtopic.php?f=14&t=2562636
https://www.phpbb.com/community/viewtopic.php?f=14&t=2562631