CVE-2026-34234 PoC — CtrlPanel: Unauthenticated RCE using installer script

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34234.yaml

Associated Vulnerability

Title: CtrlPanel: Unauthenticated RCE using installer script (CVE-2026-34234)
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.

Description

CtrlPanel versions <= 1.1.1 are vulnerable to unauthenticated Remote Code Execution (RCE) via the web installer endpoint (public/installer/index.php). The installer loaded and executed form handler files before checking for the install.lock gate, allowing attackers to reach installer forms on fully-deployed instances. User-supplied POST values (url, key, clientkey) from the Pterodactyl configuration form were interpolated directly into shell command strings executed via bash -c without sanitization, enabling command injection. The vulnerability is confirmed actively exploited in the wild.

File Snapshot

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