CVE-2026-40496

HIGH EPSS 32.2%
Published Apr 21, 20262mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 4.0
High
Find Similar
Published Apr 21, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
8.8
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
32.2% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-330
CWE-340

Affected Products 1

VendorProductVersionRange
freescoutfreescout* <1.8.213

References 3

  • github.com https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555
    Patch
  • github.com https://github.com/freescout-help-desk/freescout/releases/tag/1.8.213
    Release Notes
  • github.com https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-2783-wxmm-wmwr
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/freescout-help-desk/freescout/commit/dbdf8f2260b43a21818255c70f0b61b9de9cd555
    Patch