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CVE-2026-40496

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

Published: Apr 21, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-330
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.4%
Top 68.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-330CWE-340

Affected Products

freescoutfreescout-help-desk
On-premWeb App
Enterprise Software / itsm-monitoring
freescoutfreescout
Mixed
Enterprise Software / itsm-monitoring
freescout-help-deskcommercialEnterprise Software
freescoutcommercialEnterprise Softwareaka freescout

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr
github.com
https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555
github.com
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213
github.com

Timeline

Published
Apr 21, 2026
Last Updated
Apr 23, 2026

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