CVE-2026-34216 CtrlPanel: Authenticated Remote Code Execution via Dynamic Class Instantiation in SettingsController.php
Authenticated admins can execute arbitrary code by supplying malicious class names to the settings update endpoint in CtrlPanel.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34216?
CVE-2026-34216 is a medium-severity code injection vulnerability in Ctrlpanel-gg panel, published on 19 May 2026. An attacker needs administrator access to exploit it, 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 admin settings update endpoint accepted a fully qualified class name directly from user-supplied request input and used it for dynamic static method calls and object instantiation without any allowlist validation, allowing for authenticated Remote Code Execution. An authenticated admin-level user could supply an arbitrary class name available in the Composer autoloader, potentially triggering unintended constructor or magic method execution. The update() method reads settings_class directly from the HTTP request and passed it to new $settings_class() and $settings_class::getValidations() without verifying that the provided value corresponds to a legitimate settings class: Because PHP resolves class names against the Composer autoloader at runtime, any autoloadable class in the application or its dependencies could be instantiated. Depending on the classes available in the dependency tree, this can trigger unintended side effects through constructors or magic methods (__construct, __toString, __wakeup), following a PHP object injection / gadget chain pattern. This issue has been fixed in version 1.2.0.
Weakness: CWE-470
Which versions are affected by CVE-2026-34216?
How do I fix CVE-2026-34216?
No fix has been published for CVE-2026-34216 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-34216 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34216 exists.
Sources
Also known as GHSA-vcg3-fjrx-rg5q.