EUVD-2026-30983Severity by source
AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
Remote code execution in CtrlPanel versions 1.1.1 and prior allows authenticated administrators to execute arbitrary PHP code by supplying a fully qualified class name to the admin settings update endpoint, which instantiates or invokes static methods on that class without allowlist validation. Any class resolvable by the Composer autoloader - including third-party dependencies - can be targeted, enabling gadget-chain exploitation through PHP magic methods such as __construct, __toString, or __wakeup. No public exploit code has been identified at time of analysis and the vulnerability is not listed in the CISA KEV catalog; however, the fix is confirmed in version 1.2.0, released April 2026.
Technical ContextAI
The root cause is CWE-470 (Use of Externally-Controlled Input to Select Classes or Code), a class of vulnerability where attacker-controlled input directly determines which class the application loads and executes. The affected code path is the update() method of the admin settings controller, which reads a settings_class parameter directly from the HTTP request body and passes it unsanitized to both new $settings_class() and $settings_class::getValidations(). PHP's Composer autoloader resolves class names at runtime against the entire dependency tree, meaning the attack surface includes every autoloadable class in the application and all installed packages. This follows the well-documented PHP Object Injection / gadget chain pattern, where constructors or magic methods in benign dependency classes can be chained to achieve file writes, SSRF, or arbitrary command execution. The affected CPE is cpe:2.3:a:ctrlpanel-gg:panel:*:*:*:*:*:*:*:* covering all panel versions through 1.1.1.
RemediationAI
Upgrade to CtrlPanel version 1.2.0, which is confirmed to include this security fix per the official release at https://github.com/Ctrlpanel-gg/panel/releases/tag/1.2.0 and the security advisory at https://github.com/Ctrlpanel-gg/panel/security/advisories/GHSA-vcg3-fjrx-rg5q. The 1.2.0 release also contains a license change from AGPL 3.0 to MPL 2.0 and numerous bug fixes, so administrators should review the full release notes before upgrading. If immediate patching is not possible, restrict access to the admin settings update endpoint at the web server or reverse proxy layer to trusted IP ranges only - note this does not eliminate the vulnerability but raises the barrier significantly for network-based attackers. Additionally, audit and rotate all admin-level credentials to reduce the likelihood of compromised accounts being leveraged. Reducing the number of installed Composer packages (slimming the dependency tree) limits gadget chain availability but is not a reliable standalone control due to the difficulty of enumerating all dangerous chains across transitive dependencies.
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