The Mega Addons plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the vc_saving_data function in versions up to, and including, 4.2.7. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to update the plugin's settings.
https://www.wordfence.com/threat-intel/vulnerabilities/id/a1eda885-7e10-4294-9748-5359efd51754
https://plugins.trac.wordpress.org/browser/mega-addons-for-visual-composer/tags/4.2.7/main.php#L87