mt-phpincgi.php in Hajime Fujimoto mt-phpincgi before 2015-05-15 does not properly restrict URLs, which allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via a crafted request, as exploited in the wild in May 2015.
Cross-site scripting (XSS) vulnerability in the MailForm plugin before 1.20 for Movable Type allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.