SocialFit WordPress Plugin 1.2.2 Reflected XSS via popup.php msg Parameter

SocialFit plugin for WordPress through 1.2.2 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts via the unsanitized msg parameter. Attackers can craft GET requests to /wp-content/plugins/socialfit/popup.php with service=googleplus and malicious msg values to execute script and steal session cookies. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-19.