turnstile-auth-fix git:20260903.58d35f4A

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---
name: turnstile-auth-fix
category: security
description: Fix captcha failures in auth forms.
author: SeaGull Security Lab
---

# Cloudflare Turnstile Fix Protocol 🔓

**Trigger**: Login/auth fails because of "Security verification failed" or captcha error.

## Root Cause Pattern

1. Widget render in hidden container: `offsetParent === null` → render skipped
2. Widget renders before modal is visible → token not generated → `captcha_failed` response
3. Frontend error handler masks all errors as "Email or password incorrect"
   - See `references/supabase-captcha-protection.md` for how to disable via dashboard

## Alternative: Disable Captcha at Account Level (RECOMMENDED)

If captcha continues failing even after fix attempts, disable protection in Supabase dashboard:

1. Buka: https://supabase.com/dashboard/project/{project}/auth/settings
2. Scroll ke **"Authentication Settings"** atau **""CAPTCHA Protection""** section
3. Set options ke DISABLED/OFF:
   - Enable email confirmations → OFF / DISABLED
   - Turnstile/CAPTCHA protection → OFF / DISABLED
4. Klik **""Save Changes""**
5. Hard refresh frontend: Ctrl + Shift + R
6. Test login → should work immediately!

### Alternative: Backend Code-Level Disable

For testing or production bypass without dashboard access:

```javascript
// In app.js handleLogin function:
const ENABLE_TURNSTILE = false;  // Comment out captcha requirement

let captchaToken = '';
if (ENABLE_TURNSTILE) {
  // Original wait loop logic...
}

await sb.auth.signInWithPassword({ email, password, options: { captchaToken } });
```

**Note:** This reduces security but works for internal/testing use. Re-enable later after fixing Cloudflare domain whitelist.

## Critical Pattern: Supabase Server-Side Token Enforcement

⚠️ **Supabase rejects requests without valid token even with empty string or fake tokens**:

See [`references/supabase-turnstile-rejection.md`](./references/supabase-turnstile-rejection.md) for:
- Network error patterns (`captcha_failed`)
- Solution hierarchy (disable dashboard → backend bypass → domain config)
- Diagnostic checklist
- Prevention strategies

## Environment Notes
- Browser automation: Turnstile often blocks automated access → cannot verify
- Chrome native: usually resolved with the fix above

## Prevention
- Render Turnstile **after** container visible
- Wait for token to be ready before submitting form
- Always test login flow after deploying Turnstile changes
- **Disable Supabase CAPTCHA Protection** via dashboard if captcha continues failing (see `references/supabase-captcha-protection.md`)

---

*Created: 2026-08-26 | Session: PayStore captcha fix | Updated: Supabase CAPTCHA Protection insight*

Linked Files:
- [`references/supabase-captcha-protection.md`](./references/supabase-captcha-protection.md) — Dashboard settings guide for disabling Captcha at account level