CVE-2026-40496

Published April 21st, 2026

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CVSS v3

9.1

CRITICAL

CVSS v2

N/A

Affected

PROJECT

Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. Since attachment_id is sequential and size can be brute-forced in a small range, an unauthenticated attacker can forge valid tokens and download any private attachment without credentials. Version 1.8.213 fixes the issue.

freescout-help-desk/freescout

FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)

GitHub

4.32K