Description
WordPress is prone to a cross-site scripting vulnerability because the application 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 may help the attacker steal cookie-based authentication credentials and launch other attacks. WordPress versions prior to 2.8.2 are vulnerable.
Remediation
Update to WordPress version 2.8.2 or latest
References
http://www.exploit-db.com/exploits/9250/
http://packetstormsecurity.org/files/view/79605/wp281-xss.txt
http://www.securityfocus.com/bid/35797/exploit
Related Vulnerabilities
Joomla! Core 3.2.x Cross-Site Scripting (3.2.0 - 3.2.4)
WordPress 3.9.x Multiple Vulnerabilities (3.9 - 3.9.13)
WordPress Plugin Snazzy Maps Cross-Site Request Forgery (1.1.5)
Drupal Core 4.7.x Cross-Site Scripting (4.7.0 - 4.7.10)
WordPress Plugin Quiz And Survey Master-Best Quiz, Exam and Survey SQL Injection (7.1.11)