CVE-2026-67402

Remote Command Execution via Insecure Apache CGI Mapping in ConfigServer Security & Firewall Messenger v3

Published Sep 3, 2026 CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Disable Messenger v3 by setting MESSENGERV3 = "0" until version 16.31 can be installed. This is the shipped default.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Configserver
Configserver configserver Security Firewall
Vendors & Products Configserver
Configserver configserver Security Firewall
Type Values Removed Values Added
Title Remote Command Execution via Insecure Apache CGI Mapping in ConfigServer Security & Firewall Messenger v3
Type Values Removed Values Added
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.
Weaknesses CWE-552
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Sep 4, 2026, 7:47 PM
Reserved
Jul 29, 2026, 3:00 PM
Status
Deferred
Published
Sep 4, 2026, 12:17 AM
Modified
Sep 9, 2026, 3:41 PM