critical9.1
CVE-2026-40496
FreeScout is a free self-hosted help desk and shared mailbox.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Freescout | Freescout | before 1.8.213 |