Is CVE-2026-40567 actively exploited?

No active exploitation of CVE-2026-40567 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40567 be exploited remotely?

Yes. CVE-2026-40567 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40567?

CVE-2026-40567 has a CVSS score of 5.8 (MEDIUM).

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MEDIUM

CVE-2026-40567

CWE-116Published: April 21, 2026· Updated: Apr 22, 2026

5.8

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:10.3th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-40567 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.