What is Cross-Site Scripting in Cybersecurity?
Offensive SecurityXSS
Version 1.0 · Published April 2026 · Last verified April 2026
How is it pronounced?
ex-ess-ess
'Cross-site scripting' is also said in full.
A web vulnerability that lets attackers inject malicious JavaScript into pages viewed by other users. Stored XSS persists in the database. Reflected XSS bounces off the server in a URL parameter. DOM-based XSS manipulates the page's client-side code. All three steal session tokens, redirect users, or deface pages.
Why Cross-Site Scripting Matters for Your Cybersecurity Career
XSS is the most common web application vulnerability and a staple of cybersecurity penetration testing. Pen testers report XSS findings in almost every web app engagement. Security engineers implement Content Security Policy headers and input sanitization to prevent XSS. Bug bounty programs pay consistently for XSS discoveries.
Which Cybersecurity Roles Use Cross-Site Scripting?
Related Cybersecurity Terms
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Looking for the acronym? Read about XSS in the cybersecurity acronym decoder
A web vulnerability that lets attackers inject malicious JavaScript into pages viewed by other users. Stored XSS persists in the database. Reflected XSS bounces off the server in a URL parameter. DOM-based XSS manipulates the page's client-side code. All three steal session tokens, redirect users, or deface pages.
XSS is the most common web application vulnerability and a staple of cybersecurity penetration testing. Pen testers report XSS findings in almost every web app engagement. Security engineers implement Content Security Policy headers and input sanitization to prevent XSS. Bug bounty programs pay consistently for XSS discoveries.
Cybersecurity professionals who work with Cross-Site Scripting include Penetration Tester, Security Engineer, Security Architect. These roles apply Cross-Site Scripting knowledge within the Offensive Security domain.
Sources
Definitions are original explanations written for career development purposes. For authoritative technical definitions, refer to NIST, ISO, or the relevant standards body.
Last verified: April 2026?Report an inaccuracy
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