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Security Advisory: Important ConfigServer Firewall (CSF) Security Update

Posted on 6th August, 2026

Dear Valued Customer,

We would like to inform you of an important security update affecting the ConfigServer Firewall (CSF) plugin used on some Linux hosting and server (VPS and Dedicated) environments.

Summary

A recently disclosed security issue has been identified in older versions of ConfigServer Firewall (CSF). According to the vendor, multiple vulnerabilities may allow an attacker to escalate privileges and potentially gain root-level access to an affected server.

Affected Versions

Vulnerable: CSF 16.20-1 and earlier

Patched: CSF 16.30-1 and later

Potential Impact

Successful exploitation of these vulnerabilities could allow unauthorized users to gain elevated privileges on affected systems, potentially compromising server security.

Recommended Action

Customers managing their own servers should update CSF to the latest available version immediately.

CentOS 7/CloudLinux 7

	yum clean all
	/scripts/update-packages

AlmaLinux/CloudLinux 8/9/10

	dnf clean metadata
	/scripts/update-packages

Ubuntu

	apt update
	/scripts/update-packages

Ref :

https://support.cpanel.net/hc/en-us/articles/42503837957015-Security-CSF-Security-Release

Please contact our Support team if you have any questions.