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Recently, a business logic flaw was discovered in Instagram’s Meta Verified subscription system, allowing users to repeatedly obtain free verification by exploiting a loophole in promotional offer handling. The flaw involved canceling and renewing subscriptions to claim extended free access to the blue tick badge.
You Should Know:
How the Exploit Worked:
- Subscribe to Meta Verified – Purchase the subscription via the Play Store/App Store.
- Cancel the Subscription – Immediately cancel it from the payment settings.
- Wait for Promotional Offer – After a few days, check Meta Subscriptions for an offer like “Get an additional month free.”
- Renew & Repeat – Re-subscribe via the Play Store, claim the free month, then cancel again.
- Cycle Continuously – Repeat every 10 days for indefinite free verification.
Technical Analysis & Mitigation:
- Business Logic Flaw: The system failed to enforce proper checks on repeated promotional claims.
- Impact: Revenue loss for Meta, potential verification abuse.
- Detection: Monitor subscription logs for abnormal cancellation/renewal patterns.
Relevant Linux/Windows Commands for Security Testing:
- Check Active Subscriptions (Linux):
journalctl -u subscription-service --no-pager | grep "cancellation"
- Audit Logs (Windows):
Get-WinEvent -LogName "Application" | Where-Object {$_.Message -like "subscription"} - Automated Testing with cURL:
curl -X POST "https://api.instagram.com/subscription/renew" -H "Authorization: Bearer {token}"
Ethical Reporting Steps:
- Document the Issue – Record steps with screenshots/logs.
- Use Official Channels – Submit via “Report a Problem” (not bug bounty).
- Avoid Exploitation – Do not abuse the flaw for personal gain.
What Undercode Say:
Business logic flaws are often overlooked in cybersecurity but can cause significant financial and reputational damage. Regular audits, proper input validation, and subscription fraud detection mechanisms should be enforced.
Expected Output:
- A patched subscription system with rate-limiting on promotional claims.
- Improved logging for cancellation/renewal patterns.
- Awareness of non-technical vulnerabilities in payment systems.
Prediction:
Meta will likely implement stricter checks on subscription renewals and promotional offers, closing this loophole within the next update cycle.
References:
Reported By: Localh0ste Cybersecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
