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CVE-2026-67402 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://support.cpanel.net/hc/en-us/articles/43171958716439-Security-CSF-Security-Release-September-3rd-2026	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-552	Files or Directories Accessible to External Parties	[email protected]

Affected Products

Product	Versions
ConfigServer Security & Firewall	<= 16.30-1
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 16.31moderate effort Workaround:low effort Disable the MESSENGERV3 setting in CSF: 1. Access the server as the root user via SSH, or the Terminal in WHM. 2. Edit the CSF configuration file: # nano /etc/csf/csf.conf 3. Update the MESSENGERV3 option to be disabled: MESSENGERV3 = 0 4. Save and restart the CSF and LFD services: # systemctl restart csf lfd

Product

Versions

ConfigServer Security & Firewall

<= 16.30-1

CPE

No CPEs found in CPE dictionary for this product.

Remediation

Upgrade: 16.31moderate effort
Workaround:low effort
Disable the MESSENGERV3 setting in CSF: 1. Access the server as the root user via SSH, or the Terminal in WHM. 2. Edit the CSF configuration file: # nano /etc/csf/csf.conf 3. Update the MESSENGERV3 option to be disabled: MESSENGERV3 = 0 4. Save and restart the CSF and LFD services: # systemctl restart csf lfd

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 4, 2026	CVE Modified	CISA-ADP
Sep 4, 2026	New CVE Received	[email protected]