CVE-2026-26212 in Rara One Click Demo Import Plugin
Summary
by MITRE • 09/10/2026
Rara One Click Demo Import plugin for WordPress before 1.3.5 contains an arbitrary file upload vulnerability that allows authenticated attackers with Administrator privileges to upload arbitrary PHP files by passing a false value to wp_handle_upload() that disables WordPress core's file type validation checks across all three file parameters in the process_uploaded_files() function. Attackers can upload a malicious PHP file to the uploads directory and execute it over HTTP to achieve remote code execution in the web server process, with the uploaded file persisting on disk even after plugin deactivation and leaving no media library record to evade standard integrity checks.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified within Rara One Click Demo Import versions prior to 1.3.5 represents a critical security flaw rooted in improper input validation during file upload operations. This issue specifically affects authenticated users possessing Administrator privileges, which is significant because it allows individuals with high-level access to bypass core WordPress security mechanisms. The root cause lies in the process_uploaded_files function, where developers incorrectly passed a false value to the wp_handle_upload() function. In standard WordPress development practices, this parameter controls whether file type validation checks are enforced. By setting it to false, the plugin effectively disabled these safeguards across all three file parameters involved in the import process, creating an unrestricted pathway for malicious data ingestion.
From a technical perspective, the exploitation of this vulnerability allows attackers to upload arbitrary PHP files directly into the WordPress uploads directory. Because the core validation checks are bypassed, there is no filtering based on MIME types or extensions that would normally prevent executable scripts from being stored in public-facing directories. Once uploaded, these malicious PHP files can be executed via HTTP requests against the web server process. This execution context grants the attacker remote code execution capabilities equivalent to those of the web server user, typically www-data or nginx, depending on the hosting environment. The ability to execute arbitrary code at this level provides complete control over the underlying system, enabling data exfiltration, further lateral movement within the network, and persistent access mechanisms that are difficult to detect through standard means.
The operational impact of this vulnerability is severe due to its stealth characteristics and persistence. Unlike many other web application vulnerabilities where malicious files might be logged or associated with a specific media entry in the WordPress database, this flaw allows uploaded files to persist on disk without leaving any record in the media library. This absence of metadata makes traditional integrity checks and file auditing tools less effective at identifying the compromise. Attackers can maintain long-term access by placing backdoors that remain active even if the vulnerable plugin is subsequently deactivated or removed from the site, as the malicious payload resides independently within the uploads directory structure.
This vulnerability aligns with CWE-434, which describes the unrestricted upload of files with dangerous types, and CWE-94, concerning improper control of generation of code. In terms of offensive security frameworks, it maps to MITRE ATT&CK technique T1505.003, specifically Server Side Web Shell, as well as T1059.001 for Command and Scripting Interpreter execution via PHP scripts. The lack of audit trails also relates to CWE-778, insufficient logging and monitoring, which hinders incident response efforts by obscuring the initial point of entry and the presence of persistent threats.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. Administrators should immediately upgrade the Rara One Click Demo Import plugin to version 1.3.5 or later, where this validation logic has been corrected. For sites unable to update promptly due to compatibility concerns, it is advisable to disable the plugin entirely until an alternative solution can be implemented. Additionally, server-level configurations such as disabling PHP execution in the uploads directory via web server rules (e.g., using .htaccess directives for Apache or location blocks for Nginx) provide a critical layer of defense-in-depth that mitigates the impact even if file upload vulnerabilities are present. Regular auditing of uploaded files and monitoring for unusual HTTP requests targeting script files can also help in early detection of such compromises.