Critical severity10.0NVD Advisory· Published May 19, 2026· Updated May 19, 2026
CVE-2026-43633
CVE-2026-43633
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.
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Affected products
2Patches
Vulnerability mechanics
References
5- github.com/hestiacp/hestiacp/commit/854d71b3c1737b0a0d0cc55c926008ffe1f6719bnvd
- github.com/hestiacp/hestiacp/issues/5229nvd
- github.com/hestiacp/hestiacp/pull/5244nvd
- mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634nvd
- www.vulncheck.com/advisories/hestiacp-deserialization-rce-via-web-terminalnvd
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