Implement strict validation to prevent unauthorized email status changes:
- Force status to Unverified when email address changes
- Only allow client to reset status to Unverified (via reset button)
- Block client from upgrading status (Unverified→Verified, etc.)
- All status upgrades must happen server-side via verification links
This prevents attackers from:
- Submitting new emails with fake "verified" status
- Bypassing email verification by modifying client requests
- Escalating email status without proper verification flow
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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