CVE-2026-12872 in Webinfos Plugin
Summary
by MITRE • 08/03/2026
The Webinfos WordPress plugin through 1.2 does not validate the type or name of uploaded files, nor restrict the upload action with any authentication, capability, or nonce check, allowing unauthenticated attackers to upload arbitrary files (including PHP) to a web-accessible directory, leading to remote code execution on servers that execute PHP from the uploads path.
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Analysis
by VulDB Data Team • 08/03/2026
The Webinfos WordPress plugin vulnerability represents a critical security flaw that undermines fundamental web application security principles through its complete absence of file validation and authentication controls. This vulnerability exists in versions 1.2 and earlier, where the plugin fails to implement any form of input sanitization or access control mechanisms during file upload operations. The lack of type checking, name validation, and authentication verification creates an exploitable pathway that allows any remote attacker to bypass security measures and upload malicious files directly to the web server's accessible directories.
The technical implementation flaw stems from the plugin's failure to enforce proper security controls at multiple layers of the upload process. Without capability checks or nonce verification, the vulnerability operates entirely outside of WordPress's established authentication framework, rendering standard security protections ineffective. This absence of validation permits attackers to upload files with any extension, including dangerous formats like php, which can execute arbitrary code on the server when accessed through the web root. The vulnerability directly maps to CWE-434, which describes the insecure upload of executable files, and represents a classic example of insufficient input validation combined with inadequate access controls.
The operational impact of this vulnerability is severe and far-reaching, as it enables complete remote code execution capabilities for unauthenticated attackers. Once an attacker successfully uploads a malicious PHP file, they can execute arbitrary commands on the target server with the privileges of the web application user. This compromise allows for data exfiltration, system enumeration, persistence mechanisms, and potential lateral movement within the network infrastructure. The vulnerability effectively transforms any WordPress installation using this plugin into a potential command and control server or a stepping stone for further attacks, as demonstrated in numerous real-world exploitation scenarios documented in security research.
Mitigation strategies must address both immediate remediation and long-term security hardening measures to protect against such vulnerabilities. The primary recommendation involves updating to the latest version of the Webinfos plugin where proper file validation and authentication controls have been implemented. Organizations should also implement additional protective measures including restricting file upload directories from web access, implementing strict MIME type checking at the server level, and configuring proper file extension whitelisting mechanisms. Security professionals should consider deploying web application firewalls to monitor for suspicious upload patterns and implement principle of least privilege configurations that limit write permissions to upload directories. This vulnerability highlights the critical importance of following secure coding practices and adhering to ATT&CK framework techniques such as T1505.003 (Web Shell) and T1059.007 (Unix Shell) which demonstrate how such upload vulnerabilities can be exploited for remote code execution in real-world attack scenarios.