High 8.8Published Apr 20, 2026

CVE-2026-40496FreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force

Updated under an hour ago (Oct 27, 2026, 3:10 AM ET)

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It affects freescout-help-desk freescout and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-330, CWE-340
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

freescout-help-desk freescout freescout_help_desk:freescout (from the name)	before 1.8.213	CNA record
freescout freescout freescout:freescout	before 1.8.213	NVD

References

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr	x-refsource-confirm, exploit, vendor-advisory
https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555	x-refsource-misc, patch
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.