CVE-2026-40589 | THREATINT

Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, a low-privileged agent can edit a visible customer and add an email address already owned by a hidden customer in another mailbox. The server discloses the hidden customer’s name and profile URL in the success flash, reassigns the hidden email to the visible customer, and rebinds hidden-mailbox conversations for that email to the visible customer. Version 1.8.214 fixes the issue.

PUBLISHED Reserved 2026-04-14 | Published 2026-04-21 | Updated 2026-04-21 | Assigner GitHub_M

HIGH: 7.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

< 1.8.214

affected

References

github.com/...escout/security/advisories/GHSA-mv55-3mgv-fxwr exploit

github.com/...escout/security/advisories/GHSA-mv55-3mgv-fxwr

github.com/...ommit/2e2fe37111d92ac665b9ad8806eac94a1a3e502c

github.com/...scout-help-desk/freescout/releases/tag/1.8.214

cve.org (CVE-2026-40589)

nvd.nist.gov (CVE-2026-40589)

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