Better Search <= 3.1.0 - Cross-Site Request Forgery

The Better Search plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.1.0. This is due to missing or incorrect nonce validation on the bsearch_ajax_clearcache function. This makes it possible for unauthenticated attackers to clear the plugin's cache via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.