جزئیات آسیب‌پذیری

MyBB is free and open source forum software. Prior to 1.8.40, the user datahandler does not properly validate checkbox and multiselect profile field types, resulting in stored JavaScript code injection. UserDataHandler::verify_profile_fields() only performs the specialized validation when is_array($profile_fields[$field]) is true. A non-array profile_fields[fidX] value instead of the expected profile_fields[fidX][] shape falls through to generic text handling and is stored without verification. The affected value is then rendered directly by member.php and inc/functions_post.php rather than processed by the MyCode parser. The uniquely identifying implementation details include inc/datahandlers/user.php. This issue is fixed in version 1.8.40.

• https://github.com/mybb/mybb/security/advisories/GHSA-4p6g-p3qh-559v x_refsource_CONFIRM
• https://github.com/mybb/mybb/commit/c32f0c22baab704a68b8d58fcdd2f26fadbbe19b x_refsource_MISC
• https://github.com/mybb/mybb/releases/tag/mybb_1840 x_refsource_MISC
• https://mybb.com/versions/1.8.40 x_refsource_MISC