[原文]Cross-site scripting (XSS) vulnerability in printthread.php in MyBB 1.0.1 and earlier allows remote attackers to inject arbitrary web script or HTML via a thread message, which is not properly sanitized in the print view of the thread.
MyBulletinBoard (MyBB) contains a flaw that allows a remote cross site scripting attack. This flaw exists because the application does not validate input upon submission to the printthread.php script. This could allow a user to create a specially crafted URL that would execute arbitrary code in a user's browser within the trust relationship between the browser and the server, leading to a loss of integrity.
Upgrade to version 1.2 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.