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source: http://www.securityfocus.com/bid/33872/info Magento is prone to multiple cross-site scripting vulnerabilities because it fails to sufficiently sanitize user-supplied input. Attacker-supplied HTML and script code would execute in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials. Magento 1.2.0 is vulnerable; other versions may also be affected. http://www.example.com/downloader/?return=%22%3Cscript%3Ealert('xss')%3C/script%3E