Individual skill
hunt-spa-api
Discover a single-page-app's hidden backend API from its public JS bundle, then test that API for broken access control / missing authentication. One of the highest-yield web plays in modern recon — SPAs ship their entire backend route map to the browser, and the API behind them is frequently missing the auth middleware the login page implies. Built from an authorized engagement where this play found an unauthenticated financial API that an ASM scan reporting hundreds of "Criticals" completely missed. Use whenever a target serves a JS-heavy SPA (React/Vue/Angular/Next), an "app"/"console"/"dashboard"/"portal" subdomain, or any `*api*` host shows up in recon. Leaked build artifacts (source maps / .env / .git / asset-manifest) are owned by hunt-source-leak; API version-inventory and behavioral diffing by hunt-shadow-api; this skill owns mapping a live SPA's backend routes from its JS bundle and testing them for broken access control / missing auth.
skills/hunt-spa-api/SKILL.md
Source commit 961a0dd3d2d2f66a07a416ade3b1d4473b64802e
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 4, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
Install this skill
Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.
An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.
Repository context
- Repository stars (not skill ratings)
- 1,012
- Repository last updated
- Nov 5, 2026
- License
- Apache-2.0
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai-agent Repository topic
- appsec Repository topic
- bug-bounty Repository topic
- cybersecurity Repository topic
- devsecops Repository topic
- exploit-validation Repository topic
- hermes-agent Repository topic
- infosec Repository topic
- llm-security Repository topic
- nuclei Repository topic
- testing Derived category
- finance Derived category
- security Derived category
- engineering Derived category
- engineering-web Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
Read excerpt
## 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.
---
