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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
WebPros ConfigServer Security & Firewall unaffected
Version Status Constraints
2.15 affected < 16.30
ConfigServer ConfigServer Security & Firewall unaffected
Version Status Constraints
2.15 affected < *

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://support.cpanel.net/hc/en-us/articles/43387923160343-Security-CVE-2026-65639-CSF-Security-Release cve-icon cve-icon
History

Thu, 10 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Title Command Injection via ConfigServer Security & Firewall Advanced-Rule Parser

Thu, 10 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Thu, 10 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Title Command Injection via ConfigServer Security & Firewall Advanced-Rule Parser

Thu, 10 Sep 2026 16:45:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-09-10T18:19:47.504Z

Reserved: 2026-07-22T15:00:06.103Z

Link: CVE-2026-65639

cve-icon Vulnrichment

Updated: 2026-09-10T18:19:33.742Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-10T17:17:05.190

Modified: 2026-09-10T19:54:25.810

Link: CVE-2026-65639

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-10T19:30:06Z

Weaknesses