CVE-2026-40589

HIGH7.6

FreeScout has Customer Edit Cross-Mailbox Email Takeover

Published Apr 21, 2026

Modified Yesterday

Details

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.

References

WEB

https://github.com/freescout-help-desk/freescout/commit/2e2fe37111d92ac665b9ad8806eac94a1a3e502c

WEB

https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214

DETECTION

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-mv55-3mgv-fxwr

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-40589

CVSS Analysis

CVSS v3.1

7.6