EUVD-2026-25720Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
8DescriptionCVE.org
A vulnerability has been found in GreenCMS up to 2.3. This impacts the function pluginAddLocal of the file /index.php?m=admin&c=custom&a=pluginadd. The manipulation leads to unrestricted upload. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
AnalysisAI
Unrestricted file upload in GreenCMS up to version 2.3 via the pluginAddLocal function in /index.php?m=admin&c=custom&a=pluginadd allows authenticated remote attackers to upload arbitrary files, leading to potential remote code execution. The vulnerability affects only unsupported legacy versions. Publicly available exploit code exists, and the CVSS vector confirms network-accessible exploitation requiring low privileges.
Technical ContextAI
GreenCMS is a PHP-based content management system. The vulnerability resides in the administrative plugin management functionality, specifically the pluginAddLocal function that handles file uploads at the endpoint /index.php?m=admin&c=custom&a=pluginadd. The underlying flaw is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type), indicating the application fails to properly validate file types, extensions, or content before storing user-supplied files. In PHP-based CMS systems, unrestricted uploads to web-accessible directories typically allow attackers to upload PHP webshells or malicious code that execute with the web server's privileges.
RemediationAI
No vendor-released patch is available for GreenCMS because the product is no longer supported by the maintainer. Immediate remediation requires upgrading to an actively maintained CMS alternative or, if continued GreenCMS operation is unavoidable, implementing compensating controls: (1) restrict access to the /index.php?m=admin&c=custom&a=pluginadd endpoint via web application firewall rules, allowing only trusted administrative IP addresses; (2) disable the plugin upload functionality entirely if unused, by removing or renaming the custom plugin management module; (3) configure the web server to prevent execution of PHP files in the plugin upload directory via .htaccess (for Apache) or location blocks (for nginx), forcing uploaded PHP code to be treated as static files; and (4) implement strict input validation and MIME-type checking on any file upload function by applying a PHP-level patch if source code modification is feasible. The most pragmatic approach is decommissioning GreenCMS 2.3 instances and migrating to a supported CMS platform, eliminating the attack surface entirely.
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External POC / Exploit Code
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