CVE-2024-3412 in WP STAGING Backup Plugin
Summary
by MITRE • 05/29/2024
The WP STAGING WordPress Backup Plugin – Migration Backup Restore plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the wpstg_processing AJAX action in all versions up to, and including, 3.4.3. This makes it possible for authenticated attackers, with administrator-level access and above, 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 • 06/20/2026
The WP STAGING WordPress Backup Plugin presents a critical security vulnerability that stems from inadequate input validation mechanisms within its wpstg_processing AJAX endpoint. This flaw affects all plugin versions up to and including 3.4.3, creating a pathway for authenticated attackers with administrator-level privileges to execute arbitrary file uploads on targeted WordPress installations. The vulnerability specifically resides in the plugin's failure to properly validate file types during the upload process, allowing malicious actors to bypass security controls that should prevent the upload of potentially dangerous file formats.
The technical nature of this vulnerability aligns with CWE-434, which describes the weakness of unrestricted upload of executable files. Attackers exploiting this flaw can upload malicious files such as php shell scripts, web shells, or other executable content that can be executed on the target server. The attack vector leverages the existing administrative access of the authenticated user, eliminating the need for additional privilege escalation techniques. This makes the vulnerability particularly dangerous as it operates within the legitimate administrative workflow, making detection more challenging for security monitoring systems.
The operational impact of this vulnerability extends beyond simple file uploads, as it creates a potential pathway for full system compromise. Once an attacker successfully uploads malicious content, they can execute arbitrary code on the affected WordPress server, potentially leading to complete system takeover. This compromise can result in data theft, service disruption, unauthorized access to sensitive information, and the establishment of persistent backdoors. The vulnerability affects WordPress installations where the WP STAGING plugin is installed and active, making it a significant concern for organizations relying on WordPress for their web presence.
From a threat modeling perspective, this vulnerability maps to several ATT&CK techniques including T1078 for valid accounts and T1505 for server-side injection. The attack chain typically begins with an attacker obtaining administrative credentials, followed by exploitation of the file upload vulnerability to establish a foothold. Organizations should implement multiple layers of defense including regular plugin updates, network segmentation, and monitoring for unusual file upload activities. The vulnerability underscores the importance of proper input validation and the principle of least privilege in web application security, as well as the critical need for regular security audits of third-party plugins and themes.
Mitigation strategies should include immediate patching to the latest available version of the WP STAGING plugin, which addresses the file type validation issue. Additionally, organizations should implement web application firewalls to monitor and block suspicious upload attempts, conduct regular security assessments of WordPress installations, and establish strict access controls for administrative accounts. Network monitoring should be enhanced to detect unusual file upload patterns, and regular security training should be provided to administrators to recognize potential attack vectors. The vulnerability also highlights the importance of maintaining up-to-date security practices and the necessity of verifying plugin security before deployment in production environments.