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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact Low

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00386.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
idinging FreeMail unaffected
Version Status Constraints
0 affected < 5.3.2

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/idinging/freemail cve-icon cve-icon
https://github.com/idinging/freemail/blob/a95c1710e7eeb9f2c74a49ef962f4f43a36695b3/src/db/users.js#L137-L163 cve-icon cve-icon
https://github.com/idinging/freemail/commit/62ed3afdbb4de90a135c12de928e586caf01b5a1 cve-icon cve-icon
https://github.com/idinging/freemail/issues/73 cve-icon cve-icon
https://github.com/idinging/freemail/releases/tag/v5.3.2 cve-icon cve-icon
https://www.vulncheck.com/advisories/freemail-before-5.3.2-authorization-bypass-via-api-create-mailbox-claiming cve-icon cve-icon
History

Thu, 29 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 29 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
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.
Title FreeMail before 5.3.2 Authorization Bypass via /api/create Mailbox Claiming
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L'}

cvssV4_0

{'score': 7.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-29T14:02:26.966Z

Reserved: 2026-10-29T11:51:50.482Z

Link: CVE-2026-119049

cve-icon Vulnrichment

Updated: 2026-10-29T14:02:21.354Z

cve-icon NVD

Status : Deferred

Published: 2026-10-29T14:17:51.827

Modified: 2026-10-29T16:21:34.310

Link: CVE-2026-119049

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T15:30:16Z

Weaknesses