broken-access-control

Contents

• Scope & authorization
• Methodology (baseline, identity-swap, numeric IDOR)
• Runnable snippets
• IDOR numeric-parameter wordlist
• Thresholds (carry these exactly)
• Output

Scope & authorization

Only run against an application the user owns or is contractually engaged to test. This is an ACTIVE, aggressive check: it re-sends real requests to the target under different identities and with mutated object-ids, so it creates traffic, may read or touch other users' data, and can trip rate-limits or alerts. Use a staging environment or a maintenance window where you can, keep the identities and object-ids to accounts you control, and stop if you start returning data that clearly belongs to real third parties. If scope is unclear, ask before replaying.

Two things must exist before you start:

1. A capture of the target's traffic taken as a privileged / higher-role user (from a proxy, HAR export, or your own request log). Each captured request gives you the method, URL, headers, query params, cookies, and body.
2. At least one second identity to replay under - a lower-privileged user's session, and/or the unauthenticated (no-token, no-cookie) state. An identity is either a cookie (name=value) or a bearer token (Authorization: Bearer ...).

This skill covers authorization replay and numeric IDOR on already-captured requests. It does not fuzz for hidden endpoints, mutate non-numeric/UUID object references, or bypass auth at the token layer (JWT tampering, session fixation) - note those as unrun if the target warrants a deeper pass.

Methodology (run in order; each step is a check with a result state)

1. Inventory the capture. From the privileged capture, list each request as its parts: method, full URL, headers, query params, cookies, body. These are the units you replay; you never craft new endpoints, only re-send captured ones under new conditions.

2. Baseline each request as the privileged user. Re-send it exactly as captured and record status_code and response body length. This is the reference every swapped-identity and mutated-id response is compared against, and it confirms the request still works before you draw conclusions from a difference.