Phase 8: Security, Privacy, and Judgment Traps · 25 min · Any vibe coding tool

Real-World Vibe Coding Failures

Learn from the mistakes of others. Each failure case is a lesson you don't have to learn the hard way.

Hiring signal: What changes when you use this: you recognize the patterns that lead to real-world failures — and you avoid them.

What you will learn

Learn from real-world failure cases in vibe-coded apps
Recognize the patterns that lead to each failure
Understand the consequences of shipping without security review
Apply lessons from failures to your own projects

Your Mission

Audit your app against 5 real-world failure patterns and fix any found. Output: failure_audit.md.

You need: A deployed (or near-deploy) app with Supabase.

Time: 25 minutes.

Step 1: Learn the 5 Failure Patterns (5 min)

Every failure here happened to real people. Each was preventable with the habits from previous phases.

The common thread
Every failure in this lesson has the same root cause: the developer trusted the AI's output without reviewing it. The AI built functional code — features worked, UI looked good. But the AI didn't run security checks, didn't enable RLS on every table, didn't move secrets to env vars, didn't uncomment auth checks, didn't add error handling. These are human responsibilities. The AI is a code generator; you are the reviewer.

The 5 patterns:

Exposed Database — RLS not enabled on a table → all data public
Hardcoded Key — API key in source code → scraped by bots within hours
Auth Bypass — Commented-out auth check → anyone can access protected pages
Injection Vulnerability — Unsanitized user input in queries → SQL injection
Silent Data Loss — No error check on DB operations → UI says "Saved!" but data is gone

Unlock the full lesson

You've read the first 2 sections. The rest of this lesson covers Step 2: Check Pattern 1 — Exposed Database (3 min), Step 3: Check Pattern 2 — Hardcoded Key (3 min), Step 4: Check Pattern 3 — Auth Bypass (2 min), Step 5: Check Pattern 4 — Injection Vulnerability (3 min), Step 6: Check Pattern 5 — Silent Data Loss (5 min), Step 7: Reflect on Prevention (4 min), Prevention Reflection, You're Done — plus a hands-on lab, quiz, and project artifact.

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