Broken Object Level Authorization (BOLA)

What “Broken Object Level Authorization (BOLA)” means (plain English)

Every request must verify that the caller actually owns or is permitted to read the row before returning or mutating it.

How Broken Object Level Authorization (BOLA) works in Supabase/Postgres (technical)

BOLA arises when a backend or policy trusts request parameters, relies on frontend checks, or exposes broad grants, so the database no longer enforces per-object ownership.

Attack paths & failure modes for Broken Object Level Authorization (BOLA)

• Broken Object Level Authorization (BOLA): direct API bypass: A frontend flow looks restricted, but attackers call the same endpoint or table directly with client credentials.
• Broken Object Level Authorization (BOLA): migration drift regression: Security controls were fixed earlier, but a later migration added a new object or permission path without guardrails.
• Broken Object Level Authorization (BOLA): direct API bypass: Authorization depended on UI logic and permissive grants instead of strict database boundaries.
• Broken Object Level Authorization (BOLA): migration drift regression: Schema changes lacked automated security checks, so the migration quietly recreated the exploit.
• The configuration doesn’t match what the UI implies (direct API access bypasses the app).
• Policies/grants drift over time and widen access without anyone noticing.
• Fixes are applied without verification, leading to false confidence.

Why Broken Object Level Authorization (BOLA) matters for Supabase security

Attackers exploit it by calling APIs directly, bypassing UI restrictions and touching data outside their scope. If Broken Object Level Authorization (BOLA) remains unresolved, attackers can automate enumeration and unauthorized writes at API speed. Treat it as a production reliability risk as well as a data security risk, because incidents spread quickly once clients discover weak access boundaries.

Common Broken Object Level Authorization (BOLA) mistakes that lead to leaks

• Trusting frontend checks instead of backend authorization.
• Not testing direct API access with attacker-like calls.
• Overlooking security regressions after migrations or schema changes.
• Broken Object Level Authorization (BOLA): direct API bypass: Authorization depended on UI logic and permissive grants instead of strict database boundaries.
• Broken Object Level Authorization (BOLA): migration drift regression: Schema changes lacked automated security checks, so the migration quietly recreated the exploit.

Where to look for Broken Object Level Authorization (BOLA) in Supabase

• Your grants, policies, and any direct client access paths.
• Storage and RPC settings (common blind spots).

How to detect Broken Object Level Authorization (BOLA) issues (signals + checks)

Use this as a quick checklist to validate your current state:

• Try the same queries your frontend can run (anon/authenticated). If sensitive rows come back, you have exposure.
• Verify RLS is enabled and (for sensitive tables) forced.
• List policies and look for conditions that don’t bind rows to a user or tenant.
• Audit grants to anon / authenticated on sensitive tables and functions.
• Broken Object Level Authorization (BOLA): direct API bypass: Never treat frontend checks as authorization.
• Broken Object Level Authorization (BOLA): direct API bypass: Test direct API access, not only UI paths.
• Broken Object Level Authorization (BOLA): direct API bypass: Use backend-only patterns for sensitive actions.
• Re-test after every migration that touches security-critical tables or functions.

How to fix Broken Object Level Authorization (BOLA) (backend-only + zero-policy posture)

Mockly’s safest default is backend-only access: the browser should not query tables, call RPC, or access Storage directly.

1. Decide which operations must remain client-side (often: none for sensitive resources).
2. Create server endpoints (API routes or server actions) for required reads/writes.
3. Apply hardening SQL: enable+force RLS where relevant, remove broad policies, and revoke grants from client roles.
4. Generate signed URLs for private Storage downloads on the server only.
5. Re-run a scan and confirm the issue disappears.
6. Add a regression check to your release process so drift doesn’t reintroduce exposure. Fixes that worked in linked incidents:

• Broken Object Level Authorization (BOLA): direct API bypass: Move sensitive logic to backend-only endpoints, tighten grants, and add ownership checks plus direct verification queries.
• Broken Object Level Authorization (BOLA): migration drift regression: Add migration-time security checks, policy/grant audits in CI, and a mandatory verification checklist for each release.

Verification checklist for Broken Object Level Authorization (BOLA)

1. Attempt direct access using client credentials and confirm it fails.
2. Apply a backend-only fix pattern and verify end-to-end behavior.
3. Re-run a scan after changes and after the next migration.
4. Broken Object Level Authorization (BOLA): direct API bypass: Never treat frontend checks as authorization.
5. Broken Object Level Authorization (BOLA): direct API bypass: Test direct API access, not only UI paths.
6. Broken Object Level Authorization (BOLA): direct API bypass: Use backend-only patterns for sensitive actions.
7. Broken Object Level Authorization (BOLA): direct API bypass: Re-run security checks after every migration.
8. Broken Object Level Authorization (BOLA): migration drift regression: Security regressions often happen in migrations.

SQL sanity checks for Broken Object Level Authorization (BOLA) (optional, but high signal)

If you prefer evidence over intuition, run a small set of SQL checks after each fix.

The goal is not to memorize catalog tables — it’s to make sure the access boundary you intended is the one Postgres actually enforces:

• Confirm RLS is enabled (and forced where appropriate) for tables tied to this term.
• List policies and read them as plain language: who can do what, under what condition?
• Audit grants for anon/authenticated and PUBLIC on the tables, views, and functions involved.
• If Storage is involved: review bucket privacy and policies for listing/reads.
• If RPC is involved: review EXECUTE grants for functions and whether privileged functions are server-only.

Pair these checks with a direct API access test using client credentials. When both agree, you can ship the fix with confidence.

Over time, keep a small “query pack” for the checks you trust and run it after every migration. That’s how you prevent quiet regressions.

Prevent Broken Object Level Authorization (BOLA) drift (so it doesn’t come back)

• Add a repeatable checklist and re-run it after schema changes.
• Prefer backend-only access for sensitive resources.
• Keep one reusable verification test for “Broken Object Level Authorization (BOLA): direct API bypass” and rerun it after every migration that touches this surface.
• Keep one reusable verification test for “Broken Object Level Authorization (BOLA): migration drift regression” and rerun it after every migration that touches this surface.

Rollout plan for Broken Object Level Authorization (BOLA) fixes (without breaking production)

Many hardening changes fail because teams revoke direct access first and only later discover missing backend paths.

Use this sequence to reduce both risk and outage pressure:

1. Implement and verify the backend endpoint or server action before permission changes.
2. Switch clients to that backend path behind a feature flag when possible.
3. Then revoke direct client access (broad grants, permissive policies, public bucket reads, or broad EXECUTE).
4. Run direct-access denial tests and confirm authorized backend flows still succeed.
5. Re-scan after deployment and again after the next migration.

This turns security fixes into repeatable rollout mechanics instead of one-off emergency changes.

Incident breakdowns for Broken Object Level Authorization (BOLA) (real scenarios)

Broken Object Level Authorization (BOLA): direct API bypass

Scenario: A frontend flow looks restricted, but attackers call the same endpoint or table directly with client credentials.

What failed: Authorization depended on UI logic and permissive grants instead of strict database boundaries.

What fixed it: Move sensitive logic to backend-only endpoints, tighten grants, and add ownership checks plus direct verification queries.

Why the fix worked: The fix removes client trust, enforces least privilege at the database boundary, and validates behavior with direct-access tests.

Key takeaways:

• Never treat frontend checks as authorization.
• Test direct API access, not only UI paths.
• Use backend-only patterns for sensitive actions.
• Re-run security checks after every migration.

Read full example: Broken Object Level Authorization (BOLA): direct API bypass

Broken Object Level Authorization (BOLA): migration drift regression

Scenario: Security controls were fixed earlier, but a later migration added a new object or permission path without guardrails.

What failed: Schema changes lacked automated security checks, so the migration quietly recreated the exploit.

What fixed it: Add migration-time security checks, policy/grant audits in CI, and a mandatory verification checklist for each release.

Why the fix worked: Treating security posture as a quality gate keeps regressions from shipping silently.

Key takeaways:

• Security regressions often happen in migrations.
• CI should validate grants and policies automatically.
• Release checklists need direct-access testing steps.
• Track security state before and after schema changes.

Read full example: Broken Object Level Authorization (BOLA): migration drift regression

Real-world examples of Broken Object Level Authorization (BOLA) (and why they work)

• Broken Object Level Authorization (BOLA): direct API bypass — Broken Object Level Authorization is exploited through direct API bypass.
• Broken Object Level Authorization (BOLA): migration drift regression — A migration reintroduced a regression that reopened Broken Object Level Authorization.

Related terms

• NEXT_PUBLIC Secret Leakage → /glossary/next-public-secret-leakage
• Insecure Direct Object References (IDOR) → /glossary/insecure-direct-object-references