CVE CVE-2026-43633

CVE-2026-43633

Node.jsPHP

Severity: CRITICAL
CVSS: 10CVSS
Published: 2026-05-19
Last modified: 2026-05-19
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE: CWE-502

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.

References

https://github.com/hestiacp/hestiacp/commit/854d71b3c1737b0a0d0cc55c926008ffe1f6719b
https://github.com/hestiacp/hestiacp/issues/5229
https://github.com/hestiacp/hestiacp/pull/5244
https://mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634
https://www.vulncheck.com/advisories/hestiacp-deserialization-rce-via-web-terminal

Summary

Description

References