Yabb » Yabb : Security Vulnerabilities, CVEs, Published In 2003

Cross-site scripting (XSS) vulnerabilities in Yet Another Bulletin Board (YaBB) 1.5.0 allow remote attackers to execute arbitrary script as other users and possibly steal authentication information via cookies by injecting arbitrary HTML or script into (1) news_icon of news_template.php, and (2) threadid and subject of index.html

SSI.php in YaBB SE 1.5.2 allows remote attackers to execute arbitrary PHP code by modifying the sourcedir parameter to reference a URL on a remote web server that contains the code.