CVE-2026-67402: CWE-552 Files or Directories Accessible to External Parties in WebPros ConfigServer Security & Firewall
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.
CVSS v4.0
Score 9.2critical
Affected software
WebPros
ConfigServer Security & Firewall
ConfigServer
ConfigServer Security & Firewall
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from an insecure Apache configuration in ConfigServer Security & Firewall where the /usr/bin directory is mapped as CGI programs via the Messenger v3 HTTPS virtual host. This misconfiguration permits remote unauthenticated attackers, including those whose IP addresses are blocked, to request mapped executables and run arbitrary commands with Apache user privileges. The vulnerability specifically affects versions where CSF Messenger v3 and its HTTPS mode are enabled. WebPros addressed and fixed this security flaw in version 16.31.
Potential Impact
An attacker can remotely execute arbitrary commands as the Apache user without authentication, bypassing IP address blocks. This can lead to full compromise of the web server environment under the Apache user context. The vulnerability has a CVSS 4.0 score of 9.2, indicating critical severity with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade ConfigServer Security & Firewall to version 16.31 or later, where this vulnerability has been fixed. Until the upgrade, disabling CSF Messenger v3 HTTPS mode can mitigate exposure. No official patch or temporary fix details are provided beyond the version update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-07-29T15:00:02.294Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9a0bccacd9273b49a7b13e
Added to database: 09/04/2026, 00:07:40 UTC
Last enriched: 09/07/2026, 11:53:18 UTC
Last updated: 10/18/2026, 18:48:22 UTC
Views: 122
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