vBulletin through 5.5.4 mishandles external URLs within the /core/vb/vurl.php file and the /core/vb/vurl directories.Referenceshttps://forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4423391-vbulletin-5-5-5-alpha-4-available-for-download
