Individual skill
hunt-shadow-api
Hunt shadow / zombie / undocumented API surface (OWASP API9 Improper Inventory Management) — enumerate the full API version history (v1/v2/beta/legacy paths, header- and subdomain-based versioning), pull and diff every reachable OpenAPI/Swagger spec (including ones only findable via the Wayback Machine), and behaviorally diff old vs. current versions for auth/rate-limit/validation regressions rather than just response-shape differences. Distinct from hunt-api-misconfig, which owns exploitation once you have a spec or endpoint (mass assignment, JWT, OData, Swagger-chain attacks); distinct from hunt-subdomain, which owns host-level discovery. This skill owns the version-inventory and behavioral-diff workflow itself. Use when the target has versioned API paths, multiple specs, a changelog referencing deprecated endpoints, or a mobile app whose hardcoded backend calls look older than the current web app's.
knowledge/Claude-BugHunter/skills/hunt-shadow-api/SKILL.md
Source commit 961a0dd3d2d2f66a07a416ade3b1d4473b64802e
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- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
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- Skill scan complete
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- Observed behavior
- Not checked yet
- Last checked
- Nov 4, 2026
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Repository context
- Repository stars (not skill ratings)
- 1,011
- 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
- operations Derived category
- security Derived category
- docs Derived category
- security-application Derived category
- docs-api Derived category
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## OWASP API9 — Improper Inventory Management (Shadow / Zombie APIs)
As an API evolves, old versions and internal/staging routes routinely stay reachable without
receiving the same security fixes as the current version — because nobody tracks that they
still exist. The bug is rarely in one endpoint; it's in the **delta** between what an old
version enforces and what the current version enforces on the same operation.
### When to use
Trigger when:
- Versioned paths are visible (`/v1/`, `/v2/`, `/api/2023-01-01/`) or `Accept`/`X-API-Version`
headers are in play.
- A changelog, release notes, or deprecation notice references removed/old API behavior.
- A mobile APK/IPA (via `apk-redteam-pipeline` / `ios-redteam-pipeline`) hardcodes endpoints