Is CVE-2026-40496 actively exploited?

CVE-2026-40496 has no public evidence of in-the-wild exploitation as of 2026-04-21.

What is the CVSS score for CVE-2026-40496?

CVE-2026-40496 has a CVSS score of 8.8 (HIGH severity). Vector: 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.

How do I patch CVE-2026-40496?

Vendor patch guidance is linked from the references on this page. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40496.

Which products are affected by CVE-2026-40496?

Affected products for CVE-2026-40496 are listed on this page once vendor data becomes available.

Fix CVE-2026-40496 - HIGH 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 Metrics

Vector: 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
Complexity: low
Privileges: none
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-330 CWE-340

Metadata

Primary Vendor: UNKNOWN
Published: 4/21/2026
Last Modified: 4/21/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-40496

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary