CVE-2026-40591: FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the phone-conversation creation flow accepts attacker-controlled…

PriorityP339high7.1CVSS 3.1

AVNACLPRLUINSUCLIHAN

EPSS

0.21%

11.4th percentile

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the phone-conversation creation flow accepts attacker-controlled `customer_id`, `name`, `to_email`, and `phone` values and resolves the target customer in the backend without enforcing mailbox-scoped customer visibility. As a result, a low-privileged agent who can create a phone conversation in Mailbox A can bind the new Mailbox A phone conversation to a hidden customer from Mailbox B and add a new alias email to that hidden customer record by supplying `to_email`. Version 1.8.214 fixes the vulnerability.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
freescout-help-desk	freescout	< 1.8.214	1.8.214

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