CVE-2026-40496
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductFreescout
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-330CWE-330CWE-340CWE-340
How to fix
Update
- freescout freescout1.8.213 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| freescout freescout | v < 1.8.213 | 1.8.213 |
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