Kraken.io Image Optimizer <= 2.6.5 is vulnerable to Cross-Site Request Forgery (CSRF) vulnerability

The Kraken.io Image Optimizer plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.6.5. This is due to missing nonce validation on the kraken_settings_page() function. This makes it possible for unauthenticated attackers to modify the plugin's settings, via forged request granted they can trick a site administrator into performing an action such as clicking on a link.