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Anthropic-Cybersecurity-Skills/skills/testing-for-xss-vulnerabilities-with-burpsuite/references/api-reference.md
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mukul975 27c6414ca5 Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills
Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders
2026-03-10 21:02:12 +01:00

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API Reference: Testing for XSS Vulnerabilities with Burp Suite

Burp Suite Professional Components

Scanner

  • Active scan: Automatically tests parameters for XSS
  • Passive scan: Identifies reflected inputs and missing security headers
  • Scan configuration: XSS-focused audit checks

Repeater

  • Send individual requests for manual payload testing
  • Compare request/response pairs across payload variations
  • Test character encoding behavior

Intruder

  • Positions: Mark injectable parameters
  • Payloads: Load XSS wordlists
  • Grep-Match: Flag responses containing alert(, onerror=, <script>
  • Attack types: Sniper (single param), Battering Ram (same payload all positions)

DOM Invader

  • Built-in browser extension for DOM XSS testing
  • Canary injection and sink monitoring
  • Source-to-sink data flow tracing

requests Library (Companion Script)

Reflection Detection

canary = "xsscanary12345"
resp = requests.get(f"{url}?q={canary}")
if canary in resp.text:
    # Determine context and fuzz with payloads

Character Encoding Test

resp = requests.get(f'{url}?q={quote("<>\"\'&/")}'
unencoded = [ch for ch in '<>"\'&/' if ch in resp.text]

Burp Extensions for XSS

Extension Purpose
Hackvertor Advanced payload encoding/transformation
XSS Validator Confirm XSS execution in headless browser
Reflector Highlight reflected parameters in proxy
Active Scan++ Enhanced active scanning rules

CSP Bypass Techniques

Weakness Bypass
unsafe-inline Direct <script> injection
unsafe-eval Use eval(), setTimeout()
Whitelisted CDN JSONP callback or Angular gadgets
Missing base-uri <base> tag hijack for relative scripts

References