CVE-2026-40496

HIGH

FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force

Title source: cna

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.

References (3)

Scores

CVSS v4 8.8
EPSS 0.0005
EPSS Percentile 14.1%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P

Details

CWE
CWE-330 CWE-340
Status published
Products (1)
freescout-help-desk/freescout < 1.8.213
Published Apr 21, 2026
Tracked Since Apr 21, 2026