FreeScout CVE-2026-40590

| EUVD-2026-24185 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-04-21 [email protected]
Authentication Bypass
4.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch available
Apr 21, 2026 - 19:01 EUVD
Analysis Generated
Apr 21, 2026 - 17:38 vuln.today

DescriptionNVD

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.

AnalysisAI

FreeScout prior to version 1.8.214 permits authenticated users to modify hidden customer profiles through email-based object reuse in the customer creation endpoint. By supplying an email address already associated with a hidden customer via POST /customers/ajax?action=create, an attacker can bypass unique-email validation and populate that customer's empty profile fields with arbitrary data, enabling account takeover or data manipulation without administrative privileges.

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CVE-2026-40590 vulnerability details – vuln.today
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