YaBB Bulletin Board 9.1.2000 allows remote attackers to read arbitrary files via a .. (dot dot) attack.
YabbSE 1.5.5c allows remote attackers to obtain sensitive information via a direct request to ssi_examples.php, which reveals the path.
SQL injection vulnerability in post.php for YaBB SE 1.5.4 and 1.5.5 allows remote attackers to obtain hashed passwords via the quote parameter.