CVE-2026-34234 CtrlPanel: Unauthenticated RCE using installer script
Unauthenticated attackers can execute arbitrary commands on CtrlPanel servers via the installer script due to missing lock checks and unsanitized input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34234?
CVE-2026-34234 is a critical command injection vulnerability in Ctrlpanel-gg panel, published on 19 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-34234?
How do I fix CVE-2026-34234?
No fix has been published for CVE-2026-34234 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-34234 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34234 exists.
Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.
Sources
Also known as GHSA-jmhr-q9q5-fqwh.