Automating web application security testing
Cross-site scripting (aka XSS) is the term used to describe a class of security vulnerabilities in web applications. An attacker can inject malicious scripts to perform unauthorized actions in the context of the victim's web session. Any web application that serves documents that include data from untrusted sources could be vulnerable to XSS if the untrusted data is not appropriately sanitized.
At the Google blog.
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