CVE-2026-40496

CRITICAL

9.1

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/21/2026

Last Modified4/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

freescout:freescout

Weaknesses (CWE)

CWE-330CWE-340

References

https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555(security-advisories@github.com)

https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213(security-advisories@github.com)

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.