# CVE-2026-40496

## Summary

- **CVE ID:** CVE-2026-40496
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P)
- **CWE:** CWE-330, CWE-340
- **Published:** Apr 21, 2026
- **Last Modified:** Apr 21, 2026

## 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.

## Affected Products

- freescout-help-desk — freescout (< 1.8.213)

## References

- [CNA](https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr)
- [CNA](https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555)
- [CNA](https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 33.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._