Cross-site scripting (XSS) vulnerability in res/fake_twitter/frame.php in the "verwei.se - WordPress - Twitter" (verweise-wordpress-twitter) plugin 1.0.2 and earlier for WordPress allows remote attackers to inject arbitrary web script or HTML via the base parameter.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.