CVE-2026-40589

HIGH

FreeScout has Customer Edit Cross-Mailbox Email Takeover

Title source: cna
STIX 2.1

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.

References (3)

Core 3

Scores

CVSS v3 7.6
EPSS 0.0024
EPSS Percentile 14.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-639
Status published
Products (1)
freescout-help-desk/freescout < 1.8.214
Published Apr 21, 2026
Tracked Since Apr 21, 2026