The BM Content Builder plugin for WordPress is vulnerable to unauthorized modification of data that can lead to privilege escalation due to a missing capability check on the uxcbtoolsimportitemajax AJAX action in all versions up to, and including, 3.16.2.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update arbitrary options on the WordPress site. This can be leveraged to update the default role for registration to administrator and enable user registration for attackers to gain administrative user access to a vulnerable site.

The BM Content Builder plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the uxcbremovelayoutajax() and uxcbtoolsexportajax() functions in all versions up to, and excluding, 3.17.1. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php).

The BM Content Builder plugin for WordPress is vulnerable to Directory Traversal in all versions up to 3.17.1 (exclusive) via the uxcbpagecustomizesavelayoutajax() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to read the contents of arbitrary files on the server, which can contain sensitive information.

The BM Content Builder plugin for WordPress is vulnerable to unauthorized modification of data to a missing capability check on the 'uxcbpageoptionssave' function in all versions up to, and including, 3.16.2.1. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.