CVE-2026-40590
MEDIUMFreeScout's Customer AJAX Create Modifies Hidden Existing Customer
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-wjw4-8xg6-342m
X_Refsource_Misc x_refsource_misc
https://github.com/freescout-help-desk/freescout/commit/b3d7611e6e173ed8a5e525b791deb6b32cf1ce62
X_Refsource_Misc x_refsource_misc
https://github.com/freescout-help-desk/freescout/releases/tag/1.8.214
Scores
CVSS v3
4.3
EPSS
0.0021
EPSS Percentile
11.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-639
Status
published
Products (1)
freescout-help-desk/freescout
< 1.8.214
Published
Apr 21, 2026
Tracked Since
Apr 21, 2026