DISPUTED Jelsoft vBulletin 3.5.4 allows remote attackers to register multiple arbitrary users and cause a denial of service (resource consumption) via a large number of requests to register.php. NOTE: the vendor has disputed this vulnerability, stating "If you have the CAPTCHA enabled then the registrations wont even go through. ... if you are talking about the flood being allowed in the first place then surely this is something that should be handled at the server level."

DISPUTED PHP remote file inclusion vulnerability in install/upgrade301.php in Jelsoft vBulletin 3.5.4 allows remote attackers to execute arbitrary PHP code via a URL in the step parameter. NOTE: the vendor has disputed this vulnerability, saying "The default vBulletin requires authentication prior to the usage of the upgrade system."

Cross-site scripting (XSS) vulnerability in Jelsoft vBulletin allows remote attackers to inject arbitrary web script or HTML via an SWF file that uses ActionScript to trigger execution of JavaScript.

Cross-site scripting (XSS) vulnerability in Jelsoft vBulletin 3.5.4 and 3.6.0 allows remote attackers to inject arbitrary web script or HTML by uploading an attachment with a .pdf extension that contains JavaScript, which is processed as script by Microsoft Internet Explorer 6.

PHP remote file inclusion vulnerability in VBulletin 3.5.1, 3.5.2, and 3.5.4 allows remote attackers to execute arbitrary code via a URL in the systempath parameter to (1) ImpExModule.php, (2) ImpExController.php, and (3) ImpExDisplay.php.