# CVE-2026-40590

> Vulnerability · severity: **MEDIUM** (CVSS 4.3).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40590
- **Published:** 2026-04-21
- **CVSS severity:** MEDIUM
- **CVSS base score:** 4.3
- **CWE codes:** CWE-639

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40590

## Citation

> AI Analytics. CVE-2026-40590. Retrieved 2026-07-29 from https://api.ai-analytics.org/cve/CVE-2026-40590. Derived from NIST NVD. Licensed CC0.

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