VULNERABILITY INTELLIGENCE

CVE-2026-40496

CVSS score9.1 CRITICAL
EPSS probability0.40%
CISA KEVNot currently listed
Published2026-04-21
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-330

Primary references