Is CVE-2026-40590 actively exploited?

No active exploitation of CVE-2026-40590 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40590 be exploited remotely?

Yes. CVE-2026-40590 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40590?

CVE-2026-40590 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-40590

CWE-639Published: April 21, 2026· Updated: Apr 22, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.0th

Official Description

FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.214, the Change Customer modal exposes a “Create a new customer” flow via POST /customers/ajax with action=create. Under limited visibility, the endpoint drops unique-email validation. If the supplied email already belongs to a hidden customer, Customer::create() reuses that hidden customer object and fills empty profile fields from attacker-controlled input. Version 1.8.214 fixes the vulnerability.

NVD Source

Technical Analysis

CVE-2026-40590 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.