cPanel Urges Users to Patch ConfigServer Firewall Remote Code Execution Flaw

Gbhackers •Divya • September 11, 2026

A recently disclosed vulnerability in ConfigServer Security & Firewall (CSF) could allow unauthenticated remote attackers to execute arbitrary commands through the product’s MESSENGER service. This vulnerability, tracked as CVE-2026-65638, affects CSF versions 14.00 through 16.29 and has been addressed in version 16.30 and later. CSF is widely used on Linux servers and in cPanel/WHM environments […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical CSF Vulnerability Allows Remote Code Execution A critical vulnerability in ConfigServer Security & Firewall (CSF), tracked as CVE-2026-65638, was disclosed on September 10, 2026. This flaw affects CSF versions 14.00 through 16.29, allowing unauthenticated remote attackers to execute arbitrary commands via the MESSENGER service. Administrators are urged to upgrade to version 16.30 or later to mitigate this risk. The vulnerability impacts many Linux servers, particularly those using cPanel and WHM environments. As of now, no active exploitation has been reported, but the potential for abuse remains high. Security teams should prioritize patching affected systems to prevent possible future attacks. 3 sources 58

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cPanel Urges Users to Patch ConfigServer Firewall Remote Code Execution Flaw

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