The Browser Sniff plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.3. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
https://wordpress.org/plugins/browser-sniff/
https://plugins.trac.wordpress.org/browser/browser-sniff/tags/2.3/browsersniff.php#L88