Cross-site scripting (XSS) vulnerability in TinyPHPForum (TPF) 3.6 and earlier allows remote attackers to inject arbitrary web script via a javascript: scheme in an "[a]" bbcode tag, possibly the txt parameter to action.php.
TinyPHPForum 3.6 and earlier stores the (1) users/[USERNAME].hash and (2) users/[USERNAME].email files under the web root with insufficient access control, which allows remote attackers to list all registered users and possibly obtain other sensitive information.
Directory traversal vulnerability in TinyPHPForum 3.6 and earlier allows remote attackers to create a new user account, create a new topic, or view the profile of a user account, as demonstrated via a .. (dot dot) in the uname parameter to profile.php.