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HTTP/2 200
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date: Fri, 10 Oct 2025 15:41:59 GMT
server: '; DELETE carlos FROM users --
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x-hiring-now: We're on a mission to secure the web: https://portswigger.net/careers
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Cross-site scripting (XSS) - PortSwigger
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ProfessionalCommunity Edition
Cross-site scripting (XSS)
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Last updated: October 1, 2025
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Read time: 1 Minute
Cross-site scripting (XSS) is a web security vulnerability that enables an attacker to manipulate a vulnerable web site so that it returns malicious JavaScript to users. Attackers can use malicious code to fully compromise a victim's interaction with the application.
You can use Burp Suite to test for a range of XSS vulnerabilities.