CVE-2026-43633

Critical

Published: 19/05/2026(UTC)Translated: 14/06/2026(UTC)NVD NIST

Summary

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js. This allows unauthenticated remote attackers to achieve root-level code execution.

Risk Assessment

Attackers can inject crafted data into HTTP headers, leading to arbitrary command execution on systems with the web terminal feature enabled. This poses a serious security risk to the systems.

Recommendation

It is recommended to update HestiaCP to the latest version to mitigate this vulnerability and to monitor logs for potential attack attempts.

Original NVD description (English source)

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with the web terminal feature enabled.