CVE-2026-40589CWE-639

FreeScout has Customer Edit Cross-Mailbox Email Takeover

High · published April 21, 2026

CVSS v3.1
7.6
EPSS
0%
Percentile
31.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
CVSS v4.0
Not supplied
EPSS
0.00384 · 31.3th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-04-21T16:50Z
EPSS history
Timeline
  • 21 APR 16:50Z
    FreeScout has Customer Edit Cross-Mailbox Email Takeover
    cvelistv5