CVE-2026-119049: FreeMail before 5.3.2 Authorization Bypass via /api/create Mailbox Claiming

FreeMail before 5.3.2 contains an authorization bypass vulnerability that allows authenticated users to claim another user's existing mailbox via the POST /api/create endpoint. Attackers who know a victim's address can become co-owners through assignMailboxToUser to read messages and verification codes, set forwarding, and delete mail.