Cross-site scripting (XSS) vulnerability in MyBulletinBoard (MyBB) allows remote attackers to inject arbitrary web script or HTML via a signature containing a JavaScript URI in the SRC attribute of an IMG element, in which the URI uses SGML numeric character references without trailing semicolons, as demonstrated by "&#106&#97&#118&#97&#115&#99&#114&#105&#112&#116".

The original distribution of MyBulletinBoard (MyBB) to update from older versions to 1.0.2 omits or includes older versions of certain critical files, which allows attackers to conduct (1) SQL injection attacks via an attachment name that is not properly handled by inc/functions_upload.php (CVE-2005-4602), and possibly (2) other attacks related to threadmode in usercp.php.

Multiple unspecified vulnerabilities in MyBulletinBoard (MyBB) before 1.0 have unknown impact and attack vectors, a different set of vulnerabilities than those identified by CVE-2005-4199.