CVE-2026-40589: FreeScout has Customer Edit Cross-Mailbox Email Takeover
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40589?
CVE-2026-40589 is classified as a low severity vulnerability.
How do I fix CVE-2026-40589?
To fix CVE-2026-40589, upgrade to FreeScout version 1.8.214 or later.
What systems are affected by CVE-2026-40589?
CVE-2026-40589 affects FreeScout versions prior to 1.8.214.
What type of vulnerability is CVE-2026-40589?
CVE-2026-40589 is a cross-mailbox email takeover vulnerability.
Who is affected by CVE-2026-40589?
CVE-2026-40589 affects low-privileged agents in FreeScout who can edit customer information.