CVE-2026-108151 in MDTF Plugin
Summary
by MITRE • 10/14/2026
Improper Control of Generation of Code ('Code Injection') vulnerability in PluginUs.Net MDTF wp-meta-data-filter-and-taxonomy-filter allows Code Injection.This issue affects MDTF: from n/a through 1.3.9.
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Analysis
by VulDB Data Team • 10/14/2026
The identified security flaw represents a critical instance of improper control over the generation of code, commonly categorized under CWE-94 as Improper Control of Generation of Code (Code Injection). This vulnerability exists within PluginUs.Net MDTF, specifically in the wp-meta-data-filter-and-taxonomy-filter component. The affected versions span from an unspecified initial release through version 1.3.9, indicating a persistent risk for users who have not yet applied updates or are running legacy installations of this WordPress plugin.
At its core, this vulnerability stems from insufficient sanitization and validation of user-supplied input before it is processed by the application's logic engine. In typical web applications utilizing PHP frameworks like WordPress, data entered via forms, URL parameters, or HTTP headers must be rigorously checked against expected formats and types. When such controls are absent or flawed, an attacker can inject malicious script code or command sequences into the application context. The wp-meta-data-filter-and-taxonomy-filter module appears to accept input that is subsequently interpreted as executable code rather than static data. This misinterpretation allows external actors to manipulate the internal state of the application by injecting payloads that bypass standard security boundaries.
The operational impact of this vulnerability is severe, primarily due to its classification as a Code Injection flaw. Successful exploitation enables an attacker to execute arbitrary commands on the server hosting the WordPress instance or within the context of the web application itself. This can lead to full system compromise, where attackers gain unauthorized access to sensitive files, databases, and configuration settings. Beyond data theft, this capability allows for defacement of websites, installation of backdoors for persistent access, and use of the compromised server as a pivot point for further attacks against internal network resources. The ability to inject code effectively neutralizes many traditional defense mechanisms because the malicious actions are executed with the privileges of the web service account.
From an industry standard perspective, this vulnerability aligns closely with CWE-94 and is often associated with ATT&CK technique T1059, which covers Command and Scripting Interpreter abuse. Attackers leveraging this flaw would likely engage in input validation bypasses to ensure their payloads are not filtered by existing security controls before execution. The lack of proper output encoding or context-aware escaping further exacerbates the risk, as it allows injected code to be rendered and executed directly within the application environment without triggering standard error handlers that might otherwise alert administrators to malicious activity.
Mitigation strategies must focus on immediate remediation through software updates and enhanced input handling practices. Administrators should upgrade PluginUs.Net MDTF to a version later than 1.3.9, where developers have presumably addressed these security gaps by implementing stricter type checking and sanitization routines. For environments unable to update immediately due to compatibility constraints, web application firewalls can be configured to detect and block patterns associated with code injection attempts, such as common PHP function calls or shell commands embedded in HTTP requests. Additionally, enforcing the principle of least privilege for the web server process limits the potential damage if an exploit is successful by restricting file system access and command execution capabilities. Regular security audits and penetration testing should also be conducted to identify similar vulnerabilities across other plugins that handle dynamic data filtering and taxonomy management.