Just got this email from NCCIC.
WP Super Cache is one of the more popular Wordpress plugins, so definitely worth noting and updating.NCCIC / US-CERT
National Cyber Awareness System:
WP Super Cache Cross-Site Scripting (XSS) Vulnerability
04/09/2015 05:59 PM EDT
Original release date: April 09, 2015
WP Super Cache, a WordPress plugin, contains a persistent XSS vulnerability in versions prior to 1.4.4. Exploitation of this vulnerability could allow a remote attacker to take control of the affected system.
Users and administrators are encouraged to review the WP Super Cache Changelog for more information and update to version 1.4.4 if affected.