The MMA Call Tracking plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.3.15. This is due to missing nonce validation when saving plugin configuration on the `mma_call_tracking_menu` admin page. This makes it possible for unauthenticated attackers to modify call tracking configuration settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
https://plugins.trac.wordpress.org/browser/mma-call-tracking/trunk/mma_call_tracking.php#L967
https://plugins.trac.wordpress.org/browser/mma-call-tracking/trunk/mma_call_tracking.php#L61
https://plugins.trac.wordpress.org/browser/mma-call-tracking/tags/2.3.15/mma_call_tracking.php#L967
https://plugins.trac.wordpress.org/browser/mma-call-tracking/tags/2.3.15/mma_call_tracking.php#L61