New security updates released for the WordPress content management system and one of its popular plug-ins fix cross-site scripting (XSS) vulnerabilities that could allow attackers to take control of websites.

The WordPress development team released Thursday WordPress 4.0.1, 3.9.3, 3.8.5 and 3.7.5 as critical security updates.

The 3.9.3, 3.8.5 and 3.7.5 updates address an XSS vulnerability in the comment boxes of WordPress posts and pages. An attacker could exploit this flaw to create comments with malicious JavaScript code embedded in them that would get executed by the browsers of users seeing those comments.

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