SQL injection vulnerability in function/showprofile.php in FlexBB 0.5.5 allows remote attackers to execute arbitrary SQL commands, and view all usernames and passwords, via the id parameter to the showprofile page in index.php.
SQL injection vulnerability in inc/start.php in FlexBB 0.5.5 and earlier allows remote attackers to execute arbitrary SQL commands via the flexbbusername COOKIE parameter.