CVE-2026-67402
Received Received - Intake

Insecure Apache Configuration in ConfigServer Security & Firewall Enables Remote Command Execution

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: HackerOne

Description
An insecure Apache configuration in ConfigServer Security & Firewall maps /usr/bin as CGI programs through the Messenger v3 HTTPS virtual host. A remote unauthenticated attacker whose address is blocked can request a mapped executable and run arbitrary commands as the Apache user. The vulnerability affects installations where CSF Messenger v3 and its HTTPS mode are enabled. WebPros addressed the vulnerability in version 16.31.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-67402
EUVD
EUVD-2026-70850

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
webpros configserver_firewall 16.31
webpros configserver_firewall to 16.30-1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-552 The product makes files or directories accessible to unauthorized actors, even though they should not be.

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Executive Summary

This vulnerability is an insecure Apache configuration in ConfigServer Security & Firewall (CSF) that maps /usr/bin as CGI programs through the Messenger v3 HTTPS virtual host. A remote unauthenticated attacker with a blocked address can request a mapped executable and run arbitrary commands as the Apache user. It affects installations where CSF Messenger v3 and its HTTPS mode are enabled.

Detection Guidance

Check if CSF Messenger v3 HTTPS mode is enabled by inspecting the CSF configuration file for the MESSENGERV3 setting. Look for the presence of /usr/bin being mapped as CGI programs in the Apache configuration for the Messenger v3 HTTPS virtual host.

Impact Analysis

An attacker could exploit this to execute arbitrary commands on your system with the privileges of the Apache user. This could lead to unauthorized access, data theft, or further compromise of the server. The impact is significant as it allows remote code execution without authentication.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, which may violate compliance requirements under GDPR, HIPAA, and other regulations. Failure to address it may result in legal penalties, loss of trust, and reputational damage due to compromised sensitive data.

Mitigation Strategies

Update CSF to version 16.31 or newer. If updating is not possible, disable the MESSENGERV3 setting in the CSF configuration file. Restart the CSF service after making changes.

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