CVE-2026-43633
Critical · CVSS 10.0HestiaCP — PHP/Node.js session deserialization unauthenticated RCE
- CVSS
- 10.0
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- 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.
Search profile — drives PoC discovery
Symbols web terminalsession format mismatchPHP session handlerNode.js deserializationHTTP header injectionhestia-web-terminalPHPSESSIDv_sessiontrusted session valuesarbitrary command execution
Keywords CVE-2026-43633HestiaCP deserialization RCEHestiaCP web terminal exploitHestiaCP unauthenticated RCEHestiaCP session mismatchHestiaCP 1.9 PoChestiacp PHP Node.js deserializationhestiacp root RCEhestiacp CWE-502854d71b3c1737b0a0d0cc55c926008ffe1f6719b
Versions: 1.9.0 through 1.9.4
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
Status: enriched · ingested 2026-07-15T00:00:20.000Z · profiled 2026-07-15T00:30:20.000Z