CVE WatchJul 14, 2026

CVE-2026-43633

HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format misma

CVSS

10.0

Critical

EPSS

1.1%

p61

KEV

—

Exploit Today

0-100

Published: May 19, 2026 · Last modified: Jul 14, 2026 · CWE-502

EPSS · 30d

1.1%EPSS · 30 days1.1%

2026-06-302026-07-16

Technical 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.

Official references

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