CVE-2026-40496
Critical · 9.1CVSS
9.1
EPSS
0.5%
Published
Apr 21, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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