CVE-2026-40496
CRITICALFreeScout has Predictable Attachment Token that Allows Unauthenticated Private File Download via Brute Force
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr
X_Refsource_Misc x_refsource_misc
https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555
X_Refsource_Misc x_refsource_misc
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213
Scores
CVSS v3
9.1
EPSS
0.0040
EPSS Percentile
31.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-330
CWE-340
Status
published
Products (2)
freescout/freescout
< 1.8.213
freescout-help-desk/freescout
< 1.8.213
Published
Apr 21, 2026
Tracked Since
Apr 21, 2026