Individual skill
xss
Cross-Site Scripting (XSS) — reflected, stored, DOM-based XSS exploitation. Covers filter bypass, CSP evasion, bot-triggered cookie exfiltration, admin page scraping, and headless browser flag extraction. Use for any challenge involving client-side JavaScript injection, Cross payloads, cookie theft, or browser-based exploitation.
packages/decepticon/decepticon/skills/standard/exploit/web/xss/SKILL.md
Source commit df879550544d36b6b1e69062f05adae28537adf2
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- Last checked
- Nov 8, 2026
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- Repository last updated
- Nov 7, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
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Read excerpt
# Cross-Site Scripting (XSS) Exploitation
Exploits insufficient input/output sanitization to execute JavaScript in a victim's browser context.
## Win Condition — Identify FIRST
**Pattern A — Bot/Cookie Chain** (classic CTF):
- A headless browser bot visits a URL you supply via `/report` or `/contact`
- Goal: exfiltrate `document.cookie` or admin page content to your listener
- Signals: `/report` endpoint exists, challenge mentions "admin visits", cookie in session
**Pattern B — Server-Side Alert Trigger** (Cross 30/31/32 series):
- NO bot, NO cookie exfiltration, NO `/report` endpoint (returns 404)
- The challenge evaluates reflected JS server-side; `alert("XSS")` or `alert(1)` in the response = flag