How broadly exploitable is this vulnerability?

Exploitation is constrained to environments where user visibility is limited via `limit_user_customer_visibility` and users with such scoped access can trigger customer merges. In those configurations, any user who can influence or initiate merges may be able to access customers outside their intended scope.

What level of access does an attacker need?

An attacker must have a valid account within the FreeScout instance with permissions to interact with customer entities or the merge functionality. They do not need administrative access, but they must be able to reach the customer merge workflow.

What is the safest general fix pattern?

The most robust fix pattern is to centralize and enforce object-level authorization checks for all customer operations, ensuring that the same visibility rules used for reading a customer are also applied to merging, updating, and reassigning customers. Sensitive operations should be constrained to roles that are explicitly granted broader visibility, and any operation that crosses visibility boundaries should be blocked or require elevated authorization.

Severity:

HIGH RISK

(7.6)

Insecure Customer Merge Authorization (CWE-639) in FreeScout Help Desk

CVE-2026-39384

Published:

Apr 7, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-94

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

Remote Code Execution by authenticated users via malicious file upload

May 10, 2026

CWE-94

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

Broken Access Control / Insecure Direct Object Reference

CWE:

CWE-639

Impact:

Unauthorized Access to Customer Data

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Broken Access Control / Insecure Direct Object Reference

CWE:

CWE-639

Impact:

Unauthorized Access to Customer Data

Severity:

HIGH RISK

(7.6)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

Ship clean & secure code faster

Start Free Trial

Get Pentest Report

CodeAnt AI is an offensive and defensive security platform.

Defensive + offensive security.

From first line of code to a pentest
that knows every line of it.

SOC 2 Type II certified | CodeAnt AI is independently audited and compliant with SOC 2 Type II security standards

Ask AI for summary of CodeAnt

Defensive + offensive security.

From first line of code to a pentest that knows every line of it.

Ask AI for summary of CodeAnt

Defensive + offensive security.

From first line of code to a pentest that knows every line of it.

Ask AI for summary of CodeAnt

Insecure Customer Merge Authorization (CWE-639) in FreeScout Help Desk

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

Product

Compare

Company

Developers

Legal

Product

Compare

Company

Developers

Legal

Product

Compare

Company

Developers

Legal