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Vulnerability details

CVE-2026-43633

hestiacp hestiacp

HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal

CVSS 4.0
9.5Critical

Official 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.

CVSS scores

ScoreVersionSourceVector
9.5Critical 4.0 CVEProject cvelistV5 (CNA) (VulnCheck) 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
10.0Critical 3.1 CVEProject cvelistV5 (CNA) (VulnCheck) CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
hestiacp hestiacp 1.9.0 ≤ v ≤ 1.9.4 CVEProject cvelistV5 (CNA)

References and advisories

5
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Details

Published
2026-05-19
Last updated
2026-11-08
State
Published
Assigner (CNA)
VulnCheck

Exploit prediction (EPSS)

1.07%
Probability of exploitation in 30 days
65%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
Yes
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-502
    Deserialization of Untrusted Data