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.
Published: 2026-09-03
Score: 9.2 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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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

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History

Fri, 04 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Configserver
Configserver configserver Security Firewall
Vendors & Products Configserver
Configserver configserver Security Firewall

Fri, 04 Sep 2026 02:15:00 +0000

Type Values Removed Values Added
Title Remote Command Execution via Insecure Apache CGI Mapping in ConfigServer Security & Firewall Messenger v3

Fri, 04 Sep 2026 00:00:00 +0000

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'}


Subscriptions

Configserver Configserver Security Firewall
cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-09-04T19:47:36.330Z

Reserved: 2026-07-29T15:00:02.294Z

Link: CVE-2026-67402

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-04T00:17:13.690

Modified: 2026-09-04T20:17:25.317

Link: CVE-2026-67402

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-04T15:15:14Z

Weaknesses