Forex Calculators <= 1.3.7 - Missing Authorization to Authenticated (Subscriber+) Settings Update

The Forex Calculators plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the ajax_settings_callback() function in all versions up to, and including, 1.3.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update the plugin's settings.