CVE-2026-14289 in FacturaONE para WooCommerce con VeriFactu Plugin
Summary
by MITRE • 07/27/2026
The FacturaONE para WooCommerce con VeriFactu WordPress plugin before 5.37 does not authenticate one of its request handlers, whose only protection is derived from a cryptographic key that is empty in the default, unconfigured state, allowing unauthenticated attackers to write an arbitrary file into a web-accessible directory and achieve remote code execution.
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Analysis
by VulDB Data Team • 07/27/2026
The vulnerability exists within the FacturaONE para WooCommerce with VeriFactu WordPress plugin version 5.37 and earlier, representing a critical authentication flaw that undermines the security posture of affected WordPress installations. This issue stems from an improperly configured request handler that lacks proper authentication mechanisms, relying solely on a cryptographic key that remains empty when the plugin is installed in its default state. The absence of authentication controls creates an exploitable pathway where malicious actors can bypass normal access restrictions and gain unauthorized control over the web server.
The technical implementation flaw lies in the plugin's architecture where one of its request handlers operates without mandatory authentication checks, despite requiring sensitive operations to be performed. This handler utilizes a cryptographic key for protection but fails to validate whether this key has been properly configured or populated with meaningful values. When the plugin is installed without proper configuration, this cryptographic key remains empty, effectively removing any protective barrier against unauthorized access. The vulnerability specifically targets the file writing functionality within web-accessible directories, allowing attackers to upload malicious files directly to locations where they can be executed by the web server.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables full remote code execution capabilities for unauthenticated attackers. Once an attacker successfully exploits this flaw, they can upload arbitrary files to any web-accessible directory on the target system, potentially including malicious scripts or binaries that can be executed by the web server. This creates a persistent backdoor opportunity and allows attackers to maintain long-term access to the compromised WordPress installation, making it a particularly dangerous vulnerability for organizations relying on this plugin for their invoicing and accounting processes.
Security professionals should consider this vulnerability in the context of the CWE-284 access control weakness classification, which specifically addresses insufficient access control mechanisms that allow unauthorized users to perform privileged actions. The ATT&CK framework would categorize this as a privilege escalation technique where an attacker leverages misconfigured components to gain elevated system access. Organizations using this plugin should immediately implement mitigations including updating to version 5.37 or later, which properly configures the cryptographic key validation, and implementing additional security measures such as restricting file upload capabilities, monitoring for unauthorized file creations, and conducting regular security assessments of WordPress plugins and themes.
The vulnerability demonstrates a fundamental flaw in plugin security design where default configurations do not provide adequate protection against exploitation, highlighting the importance of proper security hardening practices during software deployment. The empty cryptographic key serves as a clear indicator of poor security implementation where developers failed to consider that default states should always maintain security controls, even when configuration parameters have not been explicitly set by administrators. This particular issue underscores the need for comprehensive security testing of plugin components and proper validation of cryptographic keys in all security-relevant functions.
Organizations should prioritize immediate remediation efforts including updating to the patched version 5.37 or later, which implements proper authentication controls and validates cryptographic key configurations. Additionally, system administrators should review their WordPress plugin management practices to ensure that all installed plugins undergo security assessment before deployment and that default configurations are properly hardened according to security best practices. The vulnerability also emphasizes the importance of network segmentation and monitoring for suspicious file creation activities in web-accessible directories as part of a comprehensive defensive strategy against similar exploitation techniques.
The security implications extend beyond the immediate compromise of individual WordPress installations, potentially affecting entire networks if these systems serve as entry points for broader attacks. This vulnerability type represents a common pattern in plugin security where insufficient attention to default state configurations creates exploitable conditions that can be leveraged by threat actors without requiring advanced technical skills or prior access to the target environment. Proper patch management and security awareness training for administrators remain critical components in mitigating such vulnerabilities and maintaining overall system security posture against evolving threats.