domxss

domxss is a command for coding agents from Awarexone/Agentic-Bug-Hunter. It costs 0 tokens per session (617 once invoked), scanned A, original, MIT.

A command that checks for DOM XSS, a web security flaw where input from a URL can make a page run unwanted code in the visitor's browser. It uses a real headless Chromium browser and reports a finding only when its test payload actually runs.

In plain words
What is it for?
Testing URL parameters and fragments for DOM XSS, confirming browser execution with a canary payload, optionally saving a screenshot, and producing JSON output.
Why use it?
It avoids treating text that is merely reflected in a page as a confirmed vulnerability. This reduces false reports caused by escaping, browser security rules, or code paths that never execute.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/awarexone/agentic-bug-hunter/domxss
Clone the repo
git clone --depth 1 https://github.com/Awarexone/Agentic-Bug-Hunter
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 617 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00617
Opus 5 $0.00000 $0.00309
Sonnet 5 $0.00000 $0.00123
Haiku 4.5 $0.00000 $0.00062

Measured 3d ago against content hash 6ff11a298ec1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

domxss scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

commands/domxss.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/domxss

Reflected-XSS scanners see a payload echoed back in HTML but can't tell whether it ran — CSP, framework auto-escaping, or a sink that never reaches eval/innerHTML all silently kill it. This drives headless Chromium, fires a uniquely-tagged payload through each parameter and the URL fragment, and only reports a finding when the browser executes the canary. That's the difference between "reflected, maybe" and a report-ready [CONFIRMED] DOM XSS.

Usage

/domxss "https://app.target.com/search?q=test"
/domxss "https://app.target.com/#name=x&redirect=y" --params name,redirect
/domxss "https://app.target.com/?q=1" --shot shots/domxss.png --json

Run directly:

tools/dom_xss_harness.py "https://app.target.com/search?q=test"

Requires

Playwright (a new dependency, registered in tools/external_arsenal.sh):

pip install playwright && playwright install chromium

If it isn't installed the command prints this hint and exits cleanly — the rest of the toolkit is unaffected.

How it decides

Verdict Meaning
[CONFIRMED] the payload's unique canary executed in-browser — fired via alert/prompt/confirm, a hooked window.__cbbx sink, or the console. JS ran.
[POSSIBLE] the canary is reflected into the DOM but did not execute (likely CSP/escaping). Worth a manual look, not a finding on its own.

Injection points: every ?query parameter and every #fragment key (fragment-based DOM XSS never reaches the server, so server-side scanners miss it entirely). Add more with --params.

Why this matters

DOM XSS, client-side prototype pollution, and PostMessage bugs need a real DOM — this is the harness that lets the agent confirm them instead of guessing. A [CONFIRMED] hit passes /validate on its own because execution is proven; --shot captures the screenshot for /report.

Chain

/recon → JS/param discovery → /domxss "<url>" --params <candidates>[CONFIRMED]/report with the screenshot. Pairs with /sast (find the sink in source) → /domxss (prove it fires).

Read the full file on GitHub · 62 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 62 lines · 0 tokens per session scan A 6ff11a298ec1

Subscribe to this mod's changes

domxss is a command published in the GitHub repository Awarexone/Agentic-Bug-Hunter (4,684 stars, last pushed 2d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 617 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other commands, from other repositories

recon

Run full recon pipeline on a target — subdomain enum (Chaos API + subfinder), live host discovery (dnsx + httpx), URL crawl (katana + waybackurls + gau), gf pattern classification, nuclei scan. Outputs to recon/ / directory. Usage: /recon target.com.

elementalsouls/Claude-BugHunter · 65 tokens

hunt

Active vulnerability hunting. Two-track dispatcher — asks Red Team vs WAPT, hands off to hunt-dispatch skill and sibling commands. Usage: /hunt target.com | /hunt .target.com | /hunt targets.txt [--vuln-class X] [--source-code P] [--chrome].

elementalsouls/Claude-BugHunter · 63 tokens

token-scan

Meme coin and token security scan — checks for rug pull vectors (hidden mint, honeypot, fee manipulation, LP lock bypass, authority retention, bonding curve exploits, fake renounce, sandwich amplification). Manual 8-class grep audit (with an optional automated scanner if present). Usage: /token-scan [--chain solana].

elementalsouls/Claude-BugHunter · 79 tokens

autopilot

Run autonomous hunt loop on a target — scope check → recon → rank surface → hunt → validate → report with configurable checkpoints. Usage: /autopilot target.com [--paranoid|--normal|--yolo].

elementalsouls/Claude-BugHunter · 49 tokens

triage

Quick 7-Question Gate triage on a finding before writing a report. Kills N/A submissions before they happen. Faster than /validate — for quick go/no-go decisions. Usage: /triage.

elementalsouls/Claude-BugHunter · 45 tokens

validate

Validate a finding — runs 7-Question Gate + 4-gate checklist. Kills weak findings before report writing. Prevents N/A submissions that hurt validity ratio. Usage: /validate.

elementalsouls/Claude-BugHunter · 41 tokens