Individual skill

api-versioning

Find and attack old/shadow API versions that missed a fix — improper inventory management. Load when the API is versioned (/v1, /v2, /api/2021-01), on "old API", or after mapping the surface. Signals: version in path/header/subdomain, deprecated docs, mobile app using an older version.

skills/api/api-versioning/SKILL.md

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Observed behavior: Instructions only
Last checked: Nov 11, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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agent-skills Repository topic
ai-agents Repository topic
ai-security Repository topic
application-security Repository topic
blue-team Repository topic
bug-bounty Repository topic
claude-code Repository topic
codex Repository topic
detection-engineering Repository topic
gemini Repository topic
docs Derived category

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SKILL.mdcore · 2,238 bytes

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# API versioning attacks

## When it applies
The API exposes multiple versions and a vulnerability fixed in the current version still lives in
an older or undocumented one. Old versions rarely get the same auth, validation, or rate-limit hardening.

## Why it works
Teams patch the latest version and leave `/v1` (and `/beta`, `/internal`, dated versions) running
for backward compatibility. Those endpoints often skip a fix, lack a new authz check, or expose
fields later removed — same data, weaker guard.

## Method
1. **Enumerate versions**: swap the version in path (`/v1`↔`/v2`↔`/v3`), header
   (`Accept: application/vnd.api+json;version=1`, `X-API-Version`), or subdomain