Post.pl in YaBB 1 Gold SP 1.2 allows remote attackers to modify records in the board's .txt file via carriage return characters in the subject field.
Yet Another Bulletin Board (YaBB) 1.40 and 1.41 does not require a user to submit the correct password before changing it to a new password, which allows remote attackers to modify passwords by stealing the cookie of another user, modifying the expiretime setting, and submitting the change in a profile2 action to index.php.