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CVE-2026-43633

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CVE-2026-43633

Published: May 19, 2026

Modified: May 19, 2026

PUBLISHED

CVSS v3.1

10.0

CRITICAL

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.

VendorProductVersions

hestiacp

hestiacp

affected
1.9.0 - <= 1.9.4
unaffected
854d71b3c1737b0a0d0cc55c926008ffe1f6719b

Weaknesses (CWE)

CWE-502

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

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