MyBB Group MyBB contains a File Inclusion vulnerability in Admin panel (Tools and Maintenance -> Task Manager -> Add New Task) that can result in Allows Local File Inclusion on modern PHP versions and Remote File Inclusion on ancient PHP versions. This attack appear to be exploitable via Must have access to admin panel. This vulnerability appears to have been fixed in 1.8.15.

MyBB 1.8.15, when accessed with Microsoft Edge, mishandles 'target="_blank" rel="noopener"' in A elements, which makes it easier for remote attackers to conduct redirection attacks.

MyBB 1.8.14 is not checking for a valid CSRF token, leading to arbitrary deletion of user accounts.

MyBB 1.8.14 has XSS via the Title or Description field on the Edit Forum screen.

The installer in MyBB before 1.8.13 has XSS.

The installer in MyBB before 1.8.13 allows remote attackers to execute arbitrary code by writing to the configuration file.

In MyBB before 1.8.11, the smilie module allows Directory Traversal via the pathfolder parameter.

In MyBB before 1.8.11, the Email MyCode component allows XSS, as demonstrated by an onmouseover event.

MyBB before 1.8.11 allows remote attackers to bypass an SSRF protection mechanism.

Cross-site scripting (XSS) vulnerability in the User control panel in MyBB (aka MyBulletinBoard) before 1.8.7 and MyBB Merge System before 1.8.7 might allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.