---
id: CVE-2026-65639
title: >-
  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-supplie…
summary: >-
  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-supplie…
severity: critical
cvss: 9.5
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-78
vendor: WebPros
product: ConfigServer Security & Firewall
affected:
  - configserver_security_firewall >= 2.15 < 16.30
  - security_firewall >= 2.15 < *
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T18:19:30.960257Z'
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T18:19:47.504Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-65639'
references:
  - url: >-
      https://support.cpanel.net/hc/en-us/articles/43387923160343-Security-CVE-2026-65639-CSF-Security-Release
tags:
  - cve.org
epss: 0.01419
epssPercentile: 0.7169
ingestedAt: '2026-09-11T17:50:33.679Z'
---

## Overview

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.

## Affected

- `configserver_security_firewall >= 2.15 < 16.30`
- `security_firewall >= 2.15 < *`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.