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Critical CSF Vulnerability Allows Remote Code Execution

Critical CSF Vulnerability Allows Remote Code Execution

First seen 11 Sep 2026, 12:46 UTC • •
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ThreatCluster AI
ThreatCluster •September 12, 2026 at 11:54 UTC
  • •CVE-2026-65638 allows remote code execution in CSF versions 14.00 to 16.29.
  • •Administrators must upgrade to CSF version 16.30 or later to mitigate the vulnerability.
  • •No active exploitation has been confirmed, but the risk remains significant.

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.

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Timeline

2026-09-10
CVE-2026-65638 published
A critical vulnerability in CSF was disclosed, allowing remote command execution through the MESSENGER service.
Cybersecuritynews
2026-09-11
Security advisories issued
cPanel urged users to patch their installations to prevent potential exploitation of the vulnerability.
Gbhackers

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Extracted Entities (12)

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