Describe CVE-2015-4557.
What is CVE-2015-4557?
Cross-site scripting (XSS) vulnerability in the new_Twitter_sign_button function in nextend-Twitter-connect.php in the Nextend Twitter Connect plugin before 1.5.2 for WordPress allows remote attackers to inject arbitrary web script or HTML via the redirect_to parameter.  NOTE: this may overlap CVE-2015-4413..