CVE-2026-40590
FreeScout's Customer AJAX Create Modifies Hidden Existing Customer
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | freescout-help-desk |
| Product | freescout |
| Published | Apr 21, 2026 |
| Last Updated | Apr 21, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
freescout-help-desk / freescout
< 1.8.214