hunt-business-logic SKILL.md skillA
hunt-business-logic from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add novaestellar/novahaku/hunt-business-logic@git:20260910.546fe86Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- novaestellar/novahaku
- Path
testing/hunt/hunt-business-logic/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260910.546fe86, committed Sep 10, 2026
- First version recorded
- Sep 3, 2026
- Size
- 17,544 bytes
- Repository stars
- 28
- License
- MIT
Hunting skill for business logic vulnerabilities. Built from 12 public bug bounty reports. Covers coupon-race-stacking (Instacart, Stripe, Reverb), negative-quantity-in-cart price tampering (Upserve, Eternal/Zomato), decimal/fraction price-field overflow (Shipt), client-side checkout amount trust on PayPal redirect (WordPress.org), price-per-unit mass-assignment (Krisp), and archived-price swap / cart-TOCTOU (Stripe). Use when hunting business logic — heavy emphasis on…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Crown Jewel Targets Business logic vulnerabilities pay highest in platforms where financial transactions, identity verification, and access controls intersect with real-world consequences. The richest targets are: - **E-commerce & payment platforms** (Valve/Steam, Shopify) — payment flow manipulation, free goods, price tampering - **Marketplace & gig economy apps** (Airbnb, Uber) — identity/verification bypass enabling fraud or unsafe interactions - **SaaS with tiered access** (Mozilla Monitor) — bypassing verification to unlock monitoring features without entitlement - **High-traffic consumer apps** (Snapchat, Yelp) — rate-limit bypass enabling spam, enumeration, or abuse at scale Asset types that pay: checkout flows, subscription endpoints, callback/verification systems, webhook handlers, employee/internal portals exposed to the internet, and any endpoint that trusts client-supplied data to make authorization decisions. --- ## Attack Surface Signals **URL patterns to watch:** - `/checkout`, `/order`, `/subscribe`, `/payment`, `/verify`, `/confirm`, `/callback` - `/internal`, `/employee`, `/summit`, `/staff`, `/admin` — internal pages accidentally public …
Read the whole file at its exact version.
How to install
mdr add novaestellar/novahaku/hunt-business-logic@sha256:14e71556dccc908cThe line at the top of this page pins the label git:20260910.546fe86, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4izhj4lwmdjaftkp)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 3, 2026 and Sep 10, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260910.546fe86 latest | 2026-09-10 | 546fe86 | 17,544 B | A | view · diff |
| git:20260903.29924dd | 2026-09-03 | 29924dd | 17,556 B | A | view · diff |
| git:20260903.fa855c4 | 2026-09-03 | fa855c4 | 17,527 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (17544 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4izhj4lwmdjaftkp GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-business-logic GET https://markdownregistry.com/api/v1/blob/14e71556dccc908c7173db4f380d86ae3d8749a0e4bccec85254da9adde0a9ad
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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