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XSS Agent specializes in finding and proving cross-site scripting vulnerabilities. It analyzes injection context, crafts targeted payloads, and confirms execution in a real browser before filing a finding.

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What it does

  • Context analysis: identifies where and how user input is reflected in responses (HTML body, script blocks, tag attributes, or comments) and selects the appropriate payload strategy for each
  • Reflected XSS: tests URL parameters, form inputs, and HTTP headers for immediate reflection
  • Stored XSS: identifies injection points where input is persisted and later rendered to other users
  • DOM-based XSS: analyzes client-side JavaScript for source-to-sink patterns
  • Blind XSS: tests injection points where execution cannot be observed directly, using out-of-band callback infrastructure
  • Payload generation: crafts context-aware payloads that bypass common filters, WAF rules, CSP configurations, and encoding schemes
  • Browser-based verification: confirms execution in a real browser before reporting

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How it fits in

XSS Agent runs as part of web application pentests wherever user-controlled input is reflected or stored. For DOM-based and blind XSS, it works alongside Browser Agent to trigger and confirm client-side execution.