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CVE-2026-34234: CtrlPanel installer allows hackers to run server commands

CVE-2026-34234

Summary

CtrlPanel's web installer in versions 1.1.1 and earlier can be exploited by attackers to run arbitrary commands on the server. This vulnerability is critical for hosting providers using CtrlPanel, as it can lead to unauthorized access and data compromise. To fix this issue, update to version 1.2.0 or later.

Original title

Original description

CtrlPanel is open-source billing software for hosting providers. In versions 1.1.1 and prior, the web-based installer (public/installer/index.php) is vulnerable to unauthenticated Remote Code Execution (RCE) because it performs the install.lock check only after including and executing form handler files, leaving installer endpoints reachable on already-installed instances. The handlers also pass unsanitized user input directly into shell commands, allowing an attacker to submit crafted requests that execute arbitrary commands on the server. The vulnerability stems from two combined weaknesses: (1) premature form handler execution before the lock file gate, and (2) unsafe use of user input in shell command construction. This issue is reported to be actively exploited in the wild. The issue has been fixed in version 1.2.0.

nvd CVSS3.1 10.0

Vulnerability type

CWE-78 OS Command Injection

CWE-284 Improper Access Control

Published: 19 May 2026 · Updated: 28 May 2026 · First seen: 19 May 2026