It isn't about new tools or advanced payloads. It's about one habit:

Run the same small checklist on every target, every single time.

This alone helped turn random testing sessions into more consistent "Check as BAC" and valid reports.

1. Small, Focused Recon 🧭

For each new target:

• Open a few live subdomains in the browser.
• Note the key areas:
• login, signup
• profile, settings, account
• orders, tickets, invoices
• admin, dashboard
• api endpoints

You don't need a huge URL list, just 20–50 meaningful URLs you understand.

2. The Core Checklist ✅

Run these checks on those important URLs:

1) Access control

• Test each URL:
• Logged in
• Logged out (incognito)
• Logged in as another user
• If another user or a logged-out session can still see the page → possible Broken Access Control.

2) IDs, roles, flags

• Change things like:
• id=101 → 102 → 103
• role=user → admin
• is_admin=false → true
• Ask: "Does this make me someone else or give me more access?"

3) Sessions and reset flow

• Reuse password reset / magic links.
• Test from another browser or user.
• After logging out or password change, check if old sessions still work.

3. Quick Example 🎯

You find:

https://app.example.com/profile?id=101

Checklist:

1. Log in as User A → open /profile?id=101.
2. Log in as User B → open /profile?id=101.

If User B sees User A's data, that's a classic Broken Access Control / IDOR.

4. Short Report Pattern 📝

• Title: Broken Access Control via id Parameter
• Summary: Any user can view other users' profiles by changing id.
• Steps:

1. Login as User A → visit /profile?id=101.
2. Login as User B → open /profile?id=101.
3. User A's data is visible to User B.

• Impact: Personal data of other users is exposed.
• Fix: Check that the requested resource belongs to the logged-in user on the server side.

Final Thought …

This checklist is simple, but applying it every time made a bigger difference than any single tool or payload.