The Country Blocker for AdSense plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing nonce validation on the CBFA_guardar_cbfa() function. This makes it possible for unauthenticated attackers to update the plugin's 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/country-blocker-for-adsense/trunk/index.php#L46
https://plugins.trac.wordpress.org/browser/country-blocker-for-adsense/tags/1.0/index.php#L46