CVE-2026-40496 | THREATINT

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.

PUBLISHED Reserved 2026-04-13 | Published 2026-04-21 | Updated 2026-04-21 | Assigner GitHub_M

HIGH: 8.8CVSS: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

Problem types

CWE-330: Use of Insufficiently Random Values

CWE-340: Generation of Predictable Numbers or Identifiers

Product status

< 1.8.213

affected

References

github.com/...escout/security/advisories/GHSA-2783-wxmm-wmwr

github.com/...ommit/dbdf8f2260b43a21818255c70f0b61b9de9cd555

github.com/...scout-help-desk/freescout/releases/tag/1.8.213

cve.org (CVE-2026-40496)

nvd.nist.gov (CVE-2026-40496)

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