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.

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History

Tue, 19 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Hestiacp
Hestiacp hestiacp
Vendors & Products Hestiacp
Hestiacp hestiacp

Tue, 19 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 19 May 2026 13:45:00 +0000

Type Values Removed Values Added
Description 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.
Title HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-19T14:00:36.715Z

Reserved: 2026-05-01T18:22:45.641Z

Link: CVE-2026-43633

cve-icon Vulnrichment

Updated: 2026-05-19T13:59:11.216Z

cve-icon NVD

Status : Deferred

Published: 2026-05-19T14:16:43.460

Modified: 2026-05-19T14:43:04.157

Link: CVE-2026-43633

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T14:45:07Z

Weaknesses