pm.php (aka the PM system) in DeluxeBB 1.08, and possibly earlier, allows remote attackers to bypass authentication by providing an arbitrary username in the membercookie cookie parameter.

Multiple cross-site scripting (XSS) vulnerabilities in DeluxeBB before 1.08 allow remote attackers to inject arbitrary web script or HTML via the (1) membercookie cookie in header.php and the (2) redirect parameter in misc.php.

DeluxeBB 1.07 and earlier allows remote attackers to bypass SQL injection protection mechanisms via the login variable and certain other variables, by using lowercase "union select" or possibly other statements that do not match the uppercase "UNION SELECT."

SQL injection vulnerability in DeluxeBB 1.07 and earlier allows remote attackers to bypass authentication, spoof users, and modify settings via the (1) memberpw and (2) membercookie cookies.

DeluxeBB 1.07 and earlier does not properly handle a username composed of a single space character, which allows remote authenticated users to login as the "space" user, post as the guest user, and block the ability of an administrator to ban the "space" user.

DeluxeBB 1.07 and earlier allows remote attackers to overwrite the (1) _GET, (2) _POST, (3) _ENV, and (4) _SERVER variables via the _COOKIE (aka COOKIE) variable, which can overwrite the other variables during an extract function call, probably leading to multiple security vulnerabilities, aka "pollution of the global namespace."

SQL injection vulnerability in cp.php in DeluxeBB 1.07 and earlier allows remote attackers to execute arbitrary SQL commands via the xmsn parameter.

Multiple cross-site scripting (XSS) vulnerabilities in pm.php in DeluxeBB 1.07 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) subject or (2) to parameters.

Multiple SQL injection vulnerabilities in DeluxeBB 1.06 allow remote attackers to execute arbitrary SQL commands via the (1) hideemail, (2) languagex, (3) xthetimeoffset, and (4) xthetimeformat parameters during account registration.

PHP remote file inclusion vulnerability in DeluxeBB 1.06 allows remote attackers to execute arbitrary code via a URL in the templatefolder parameter to (1) postreply.php, (2) posting.php, (3) and pm/newpm.php in the deluxe/ directory, and (4) postreply.php, (5) posting.php, and (6) pm/newpm.php in the default/ directory.