CVE-2026-65638

Critical

Description

Improper escaping of a request URL in ConfigServer Security & Firewall allows an unauthenticated remote attacker to execute arbitrary commands as the CSF service account via shell command injection. 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.

SeverityCritical

CVSS9.2

Exploit probability—

ProductConfigServer Security & Firewall

PublishedSep 10, 2026

First seenSep 10, 2026

Weakness typeCWE-78OS command injection

How to fix

Update

WebPros ConfigServer Security & Firewall16.30 or later

Affected products

Product	Affected versions	Fixed in
WebPros ConfigServer Security & Firewall	14.00 ≤ v < 16.30	16.30
ConfigServer ConfigServer Security & Firewall	14.00	—

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