Vulnerability · Published Oct 29, 2026 · Assigned by VulnCheck
CVE-2026-119049FreeMail before 5.3.2 Authorization Bypass via /api/create Mailbox Claiming
High 7.6
In plain English
A high-severity authorization bypass via user-controlled key in FreeMail from idinging. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.4%top 67.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
References
- GitHub Issue #73 issue-tracking
- https://github.com/idinging/freemail product
- https://github.com/idinging/freemail/commit/62ed3afdbb4de90a135c12de928e586caf01b5a1 patch
- FreeMail v5.3.2 Release Notes release-notes
- https://github.com/idinging/freemail/blob/a95c1710e7eeb9f2c74a49ef962f4f43a36695b3/src/db/users.js#L137-L163 technical-description
- VulnCheck Advisory: FreeMail before 5.3.2 Authorization Bypass via /api/create Mailbox Claiming third-party-advisory