Multiple SQL injection vulnerabilities in Phorum before 5.1.22 allow remote attackers to execute arbitrary SQL commands via (1) a modified recipients parameter name in (a) pm.php; (2) the curr parameter to the (b) badwords (aka censorlist) or (c) banlist module in admin.php; or (3) the "Edit groups / Add group" field in the (d) groups module in admin.php.