CVE-2026-3891 in Pix for WooCommerce Plugin
Summary
by MITRE • 03/13/2026
The Pix for WooCommerce plugin for WordPress is vulnerable to arbitrary file uploads due to missing capability check and missing file type validation in the 'lkn_pix_for_woocommerce_c6_save_settings' function in all versions up to, and including, 1.5.0. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
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Analysis
by VulDB Data Team • 03/14/2026
The Pix for WooCommerce plugin presents a critical security vulnerability that stems from insufficient access controls and file validation mechanisms within its core functionality. This vulnerability exists in the 'lkn_pix_for_woocommerce_c6_save_settings' function where the plugin fails to implement proper capability checks that would normally restrict administrative operations to authenticated users with appropriate privileges. The absence of these security measures creates an exploitable path for unauthenticated attackers to bypass normal access controls and gain unauthorized access to the plugin's file upload functionality.
The technical flaw manifests through the complete omission of file type validation within the upload process, allowing attackers to submit any file format regardless of its intended purpose or security implications. This missing validation creates a pathway for malicious file uploads that can include web shells, malicious scripts, or other harmful content that could compromise the entire WordPress installation. The vulnerability affects all versions of the plugin up to and including version 1.5.0, indicating that this security gap has persisted across multiple releases without proper remediation.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads to potentially enable full remote code execution on affected servers. When attackers successfully upload malicious files, they can leverage these uploads to establish persistent access to the compromised system, execute arbitrary commands, and potentially escalate privileges to gain deeper control over the affected infrastructure. This makes the vulnerability particularly dangerous in environments where WordPress sites host sensitive data or serve as critical business infrastructure components.
From a cybersecurity perspective, this vulnerability aligns with CWE-434 which describes insecure file upload vulnerabilities, and represents a clear violation of the principle of least privilege that should govern all plugin functionality within WordPress ecosystems. The ATT&CK framework would categorize this as a technique involving 'T1190 - Exploit Public-Facing Application' where attackers leverage application weaknesses to gain initial access. Organizations running affected versions of this plugin face significant risk of compromise and should immediately implement mitigation strategies including plugin updates, file upload restrictions, and comprehensive security monitoring to detect any suspicious activity.
The vulnerability demonstrates the critical importance of proper input validation and access control implementation in web applications, particularly within content management systems where plugins extend core functionality. Security practitioners should consider this issue as part of broader application security assessments and ensure that all plugins undergo thorough security review before deployment in production environments. Regular security audits and vulnerability scanning should be implemented to identify similar gaps in other third-party components that may present similar risks to the overall security posture of WordPress installations.