freescout-help-desk freescout up to 1.8.212 From {%customer.fullName%} cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in freescout-help-desk freescout up to 1.8.212. Affected by this issue is some unknown functionality of the component From Handler. The manipulation of the argument {%customer.fullName%} results in cross site scripting. This vulnerability is cataloged as CVE-2026-40567. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in freescout-help-desk freescout up to 1.8.212. Affected is an unknown code block of the component From Handler. The manipulation of the argument {%customer.fullName%} with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. CVE summarizes:

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, an unauthenticated attacker can inject arbitrary HTML into outgoing emails generated by FreeScout by sending an email with a crafted From display name. The name is stored in the database without sanitization and rendered unescaped into outgoing reply emails via the `{%customer.fullName%}` signature variable. This allows embedding phishing links, tracking pixels, and spoofed content inside legitimate support emails sent from the organization's address. Version 1.8.213 fixes the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-40567 since 04/14/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 1.8.213 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 9131b16f80eade81002cb9809a2603f6b61981cf is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• freescout-help-desk

Name

• freescout

Version

• 1.8.212

License

• open-source

Website

• Product: https://github.com/freescout-help-desk/freescout/

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Once again VulDB remains the best source for vulnerability data.

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