hunt-spa-api

> **⚠️ AUTHORIZED USE ONLY**

> This skill is for educational purposes or authorized security assessments only.

> You must have explicit, written permission from the system owner before using this tool.

> Misuse of this tool is illegal and strictly prohibited.

> **Mandatory confirmation gate**

> Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:

> 1. Ask the user to state the exact target URL, IP, account, or resource.

> 2. Ask the user to confirm written authorization and the permitted scope.

> 3. Show the exact command(s) and explain their expected effect.

> 4. Wait for explicit confirmation in the current conversation.

>

> Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.

When to use this skill

Trigger when:

- A target host returns a tiny HTML shell + big `/static/js/*.js` or `/_next/static/*` bundles (React/Vue/Angular/Next/Svelte SPA)

- You see a subdomain named `console`, `app`, `dashboard`, `portal`, `admin`, `panel`, `manage`, `internal`

- Recon surfaces any `*api*`, `*-api*`, `api.*` host

- A login page is OAuth/SSO-gated (the *frontend* auth tells you nothing about whether the *API* enforces auth)

The core insight: **a SPA is a client to a backend API, and it ships the full map of that API — hosts, routes, sometimes keys — to anyone who views source.** The login page being protected says nothing about whether the API behind it checks tokens. Auth is frequently enforced on the *gateway/login* and missing on a *route group* of the API.

DO NOT skip this because "the app needs login" — that's exactly when this pays off.

---

The play (5 steps)

1. Pull the shell + enumerate the bundles

curl -s https://console.target.com/ -o index.html
# React/CRA:
grep -oE '/static/js/[^"]+\.js' index.html
# Next.js:
grep -oE '/_next/static/[^"]+\.js' index.html
# generic:
grep -oiE 'src="[^"]+\.js[^"]*"' index.html

Download every bundle (they can be multi-MB — that's fine, it's all route data):

mkdir bundles
for j in $(grep -oE '/static/js/[^"]+\.js' index.html | sort -u); do
  curl -s "https://console.target.com$j" -o "bundles/$(echo "$j"|tr '/' '_')"
done

2. Harvest API hosts, routes, and secrets from the bundles

B=bundles/*.js
# Backend API hosts (incl. dev/beta/staging variants — often weaker auth)
grep -ohiE 'https://[a-z0-9.-]*(api|console|backend|service)[a-z0-9.-]*\.target\.com[a-z0-9/_-]*' $B | sort -u
# Versioned API base paths
grep -ohiE '/api/v[0-9]+/?' $B | sort -u
# Route literals — minified bundles store routes as STRING segments, not full URLs.
# Grep for quoted "resource/action" strings:
grep -ohiE '"[a-z0-9_-]+/[a-z0-9_/-]+"' $B | tr -d '"' \
  | grep -iE '(login|user|account|order|billing|invoice|payment|deal|report|token|otp|password|reset|admin|profile|auth|upload|export|role|permission|dashboard|wallet|finance|sales)' | sort -u
# Secrets (validate before trusting — most AIza keys are Maps/analytics, not Auth)
grep -ohiE '(AIza[0-9A-Za-z_-]{35}|AKIA[0-9A-Z]{16}|sk_live_[0-9A-Za-z]+|eyJ[A-Za-z0-9_-]{10,}\.[A-Za-z0-9_-]{10,}|apiKey["'"'"']?\s*[:=]\s*["'"'"'][^"'"'"']+)' $B | sort -u

**Note:** minifiers store routes as concatenated string segments (e.g. `"account/payment/list"`), NOT full `/api/v2/...` URLs — so a naive `/api/v*` grep returns nothing. Grep for the **resource-word route strings** and prepend the base yourself.

**Lazy-loaded (async) chunks — don't stop at HTML-referenced bundles.** CRA/webpack SPAs reference only runtime+main+vendor in index.html; numbered async route chunks are named inside main.js's chunk map and loaded at runtime, so grepping only `/static/js/*.js` from the shell truncates route coverage to eager chunks.

grep -oE '[0-9]+:"[a-f0-9]+"' bundles/*main*.js        # {chunkId:"hash"} pairs
# reconstruct /static/js/<id>.<hash>.chunk.js, download each, re-run r