That's exactly what happened to me while assessing a Tesla-owned platform tied to region-specific onboarding. The application enforced strict prerequisites:

  • A region-locked phone number
  • A verified asset tied to the platform

I had neither.

At that point, the "expected" path — completing the full workflow — was effectively blocked.

The Usual Reaction (and Why I Didn't Stop)

In bug bounty, this is where most people move on.

No valid account. No way to progress. No test surface.

But instead of dropping it, I reframed the problem:

What if the workflow isn't actually required?

Shifting Focus: Frontend vs Backend

Frontend restrictions are often treated as the gatekeeper — but they're just one layer.

So rather than trying to bypass UI checks, I shifted focus toward:

  • Backend APIs
  • Supporting endpoints
  • Client-side logic

The real challenge was visibility: how do you map functionality you can't trigger?

Using JavaScript as a Map

When interaction is limited, JavaScript becomes your blueprint.

Modern applications tend to expose quite a bit through frontend bundles:

  • API routes
  • Request formats
  • Internal logic paths

Instead of manually digging through large files, I used an AI-assisted approach to extract and organize endpoints from the JavaScript.

This helped reconstruct how the application communicated with its backend — without needing to complete the workflow.

Finding What Doesn't Require Full Access

With a clearer endpoint map, the next step was filtering.

Some endpoints clearly depended on full verification. Others didn't.

The interesting ones were the "generic" components — especially anything handling files or shared resources.

Those became the focus.

Testing in Isolation

Even without completing the intended flow, I was able to:

  • Send direct requests to selected endpoints
  • Modify parameters
  • Observe backend behavior

This is where things got interesting.

One endpoint allowed retrieving files using a unique identifier. It returned data successfully — but didn't properly verify ownership.

In simple terms:

If you had a valid identifier, you could access someone else's file.

That's a classic Broken Access Control issue — specifically an IDOR.

Why This Worked

A few key reasons made this possible:

  • The backend trusted identifiers without enforcing ownership
  • Certain endpoints weren't tightly bound to user state
  • Frontend restrictions created a false sense of security

Even though the UI enforced strict checks, parts of the backend operated independently — and more loosely.

Key Takeaway

The biggest lesson here:

A blocked workflow doesn't mean the application is secure.

It just means you need a different angle.

What made the difference:

  • Ignoring frontend limitations
  • Treating JavaScript as a source of truth
  • Identifying loosely protected endpoints
  • Testing components independently

Closing Thoughts

Ironically, not being able to complete the workflow led to a better discovery process.

Instead of following the intended path, I explored the system from the outside — and that's where the real issue surfaced.

If there's one thing worth remembering:

Restrictions don't eliminate vulnerabilities — they just hide them in less obvious places.

—

Asjad Butt Security Researcher

🔗 LinkedIn: https://www.linkedin.com/in/asjad-butt/ 🐞 Bugcrowd: https://bugcrowd.com/h/asjadbutt 💻 GitHub: https://github.com/asjadbut