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Vulnerability record · CVE-2026-40496 · published 21 April 2026

CVE-2026-40496: Freescout vulnerability

Freescout · Freescout

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.

8.8 CVSS 4.0 High EPSS 0.55% · top 56.5% CWE-330 · CWE-330CWE-340 · CWE-340
8.8CVSS 4.0 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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: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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-27637Freescout vulnerabilityFreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's `TokenAuth` middleware uses …EPSS 0.84%9.3CVE-2026-32754Freescout cross-site scripting vulnerabilityFreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Versions 1.8.208 and below are vulnerable to Stored Cross-Site Scr…EPSS 0.62%9.0CVE-2024-29185Freescout os command injection vulnerabilityFreeScout is a self-hosted help desk and shared mailbox. Versions prior to 1.8.128 are vulnerable to OS Command Injection in the /public/tools.php so…EPSS 1.7%8.9CVE-2026-40498Freescout information exposure vulnerabilityFreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can access diagnostic and system …EPSS 0.73%8.8CVE-2026-27636Freescout unrestricted file upload vulnerabilityFreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to version 1.8.206, FreeScout's file upload restriction list…EPSS 2.1%8.6CVE-2025-58163Freescout deserialization of untrusted data vulnerabilityFreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Versions 1.8.185 and earlier contain a deserialization of untruste…EPSS 0.72%8.6CVE-2025-54366Freescout deserialization of untrusted data vulnerabilityFreeScout is a lightweight free open source help desk and shared inbox built with PHP (Laravel framework). In versions 1.8.185 and below, there is a …EPSS 0.98%8.6CVE-2025-48389Freescout deserialization of untrusted data vulnerabilityFreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.178, FreeScout is vulnerable to deserialization of untrusted data …EPSS 0.91%

Source: NIST National Vulnerability Database (record CVE-2026-40496), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.