Phorum 3.3.2a allows remote attackers to execute arbitrary commands via an HTTP request to (1) plugin.php, (2) admin.php, or (3) del.php that modifies the PHORUM[settings_dir] variable to point to a directory that contains a PHP file with the commands.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.209
EPSS Ranking 95.4%