Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-43633 |
| Alert Source | GitHub Advisory - Critical Vulnerability |
| CVE Publication Year | 2026 |
| Date Published | 2026-05-19 |
| Vendor | HestiaCP |
| Product | HestiaCP |
| CVSS Score | 10.0 (critical) |
| EPSS Score | No data |
| CISA KEV | No |
| Ransomware | Not confirmed |
Vulnerability 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 …
Required Actions
Apply vendor patches or mitigations as soon as available.
Who Is Affected?
This vulnerability affects HestiaCP by HestiaCP. Check if your organization uses this software and requires updates.
Sources
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