PT-2026-33910 · Freescout Help Desk · Freescout

Published 2026-04-21 · Updated 2026-04-21 · CVE-2026-40496

NVD

CVSS v4.0

8.8

High

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

Use of Insufficiently Random Values

Weakness Enumeration

CWE-340

CWE-330

Related Identifiers

CVE-2026-40496

Affected Products

Freescout

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-40496 · Security Note
• https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr · Note
• https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213 · Note
• https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555 · Note