CVE-2026-65639

OS Command Injection in ConfigServer Security & Firewall Advanced-Rule Parser

Published Sep 10, 2026 CVSS 4.0 · 9.5 Critical EPSS 1.4% KEV · Not listed
Description
OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data.

The vulnerability affects versions of the software originally distributed by ConfigServer, as well as versions of the WebPros-maintained fork that contain the vulnerable code. WebPros has addressed the vulnerability in version 16.30. Other forks or independently maintained versions of ConfigServer Security & Firewall (CSF) may also be affected and should be evaluated independently.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
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 OS Command Injection in ConfigServer Security & Firewall Advanced-Rule Parser
Type Values Removed Values Added
Title Root-Level Command Injection via ConfigServer Security & Firewall Allow/Deny Feed
Type Values Removed Values Added
Title Root-Level Command Injection via ConfigServer Security & Firewall Allow/Deny Feed
Type Values Removed Values Added
Title Command Injection via ConfigServer Security & Firewall Advanced-Rule Parser
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Command Injection via ConfigServer Security & Firewall Advanced-Rule Parser
Type Values Removed Values Added
Description OS command injection in the advanced-rule parser of ConfigServer Security & Firewall allows a remote attacker who controls a configured allow/deny feed to execute arbitrary commands as root, due to insufficient validation of feed-supplied rule data. The vulnerability affects versions of the software originally distributed by ConfigServer, as well as versions of the WebPros-maintained fork that contain the vulnerable code. WebPros has addressed the vulnerability in version 16.30. Other forks or independently maintained versions of ConfigServer Security & Firewall (CSF) may also be affected and should be evaluated independently.
Weaknesses CWE-78
References
Metrics cvssV4_0

{'score': 9.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Sep 10, 2026, 6:19 PM
Reserved
Jul 22, 2026, 3:00 PM
Status
Awaiting Analysis
Published
Sep 10, 2026, 5:17 PM
Modified
Sep 10, 2026, 7:54 PM