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.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This vulnerability has a 38.30% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.