FreeScout’s Customer AJAX Create Modifies Hidden Existing Customer_CVE-2026-40590

4.3 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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.

Basic Information

ID CVE-2026-40590

Source GitHub_M

Published Apr 21, 2026 at 16:52

Modified Apr 21, 2026 at 17:39

Affected Product

Vendor freescout-help-desk

Product freescout

Version < 1.8.214

Affected Versions freescout-help-desk freescout < 1.8.214

CWE Classification

CWE-639

References

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    "published": "2026-04-21T16:52:27.992Z",
    "modified": "2026-04-21T17:39:21.865Z",
    "type": "cve",
    "title": "FreeScout's Customer AJAX Create Modifies Hidden Existing Customer",
    "source": "GitHub_M",
    "references": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-wjw4-8xg6-342m\nhttps://github.com/freescout-help-desk/freescout/commit/b3d7611e6e173ed8a5e525b791deb6b32cf1ce62\nhttps://github.com/freescout-help-desk/freescout/releases/tag/1.8.214",
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