WordPress is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress versions 4.0.x ranging from 4.0 and up to (and including) 4.0.8 are vulnerable.
Update to WordPress version 4.0.9 or latest
WordPress 4.5.x Multiple Vulnerabilities (4.5 - 4.5.21)
WordPress Plugin Custom Field Suite Cross-Site Request Forgery (2.5.15)
WordPress Plugin Visual Link Preview Security Bypass (2.2.2)
WordPress Plugin Bitcoin/Altcoin Faucet Cross-Site Request Forgery (1.6.0)
WordPress Plugin Registration Forms-User Registration Forms, Invitation-Based Registrations, Front-end User Profile, Login Form & Content Restriction Multiple Cross-Site Scripting Vulnerabilities (1.30)