Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freescout | Freescout | < 1.8.213 |
Related Weaknesses (CWE)
References
- https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c7Patch
- https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213Release Notes
- https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wExploitVendor Advisory
FAQ
What is CVE-2026-40496?
CVE-2026-40496 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 + si...
How severe is CVE-2026-40496?
CVE-2026-40496 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-40496?
Check the references section above for vendor advisories and patch information. Affected products include: Freescout Freescout.