CVE-2026-31901: Parse Server vulnerable to user enumeration via email verification endpoint

The email verification endpoint (/verificationEmailRequest) returns distinct error responses depending on whether an email address belongs to an existing user, is already verified, or does not exist. An attacker can send requests with different email addresses and observe the error codes to determine which email addresses are registered in the application.

This is a user enumeration vulnerability that affects any Parse Server deployment with email verification enabled (verifyUserEmails: true).