CVE-2026-1730: OS DataHub Maps WordPress RCE Vulnerability

CVE-2026-1730 Overview

The OS DataHub Maps plugin for WordPress contains an arbitrary file upload vulnerability due to incorrect file type validation in the OS_DataHub_Maps_Admin::add_file_and_ext function. This security flaw affects all versions up to and including 1.8.3 and allows authenticated attackers with Author-level access or higher to upload arbitrary files to the affected site's server, potentially enabling remote code execution.

Critical Impact

Authenticated attackers can upload malicious files including PHP web shells, bypassing file type restrictions to achieve remote code execution on vulnerable WordPress installations.

Affected Products

• OS DataHub Maps plugin for WordPress versions up to and including 1.8.3
• WordPress sites using vulnerable versions of the OS DataHub Maps plugin

Discovery Timeline

• February 3, 2026 - CVE-2026-1730 published to NVD
• February 3, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1730

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The flaw exists in the file upload handling mechanism within the plugin's administrative functionality. The OS_DataHub_Maps_Admin::add_file_and_ext function fails to properly validate uploaded file types, allowing attackers to bypass security controls intended to restrict file uploads to safe formats.

The attack requires network access and authenticated credentials with at least Author-level privileges. Once exploited, an attacker gains the ability to upload executable files such as PHP scripts, which can then be accessed remotely to execute arbitrary commands on the server. This represents a complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause stems from improper file type validation in the add_file_and_ext function located in osmap-admin.php. The validation logic fails to adequately verify that uploaded files match allowed file types, relying on insufficient checks that can be bypassed by manipulating file extensions or MIME types. This allows dangerous file types to be uploaded when they should be rejected.

Attack Vector

An attacker with Author-level WordPress credentials can exploit this vulnerability through the following attack flow:

1. The attacker authenticates to the WordPress admin panel with valid Author credentials
2. They navigate to the file upload functionality provided by the OS DataHub Maps plugin
3. By crafting a malicious file (such as a PHP web shell) with a manipulated file extension or content-type header, the attacker bypasses the flawed validation
4. The malicious file is uploaded to the server's file system
5. The attacker then accesses the uploaded file directly via its URL, triggering remote code execution

The vulnerability exploits insufficient validation in the file upload handler. For technical implementation details, refer to the WordPress Plugin Code Reference and the Wordfence Vulnerability Analysis.

Detection Methods for CVE-2026-1730

Indicators of Compromise

• Unexpected PHP files or web shells in the WordPress uploads directory associated with OS DataHub Maps
• New or modified files in /wp-content/plugins/os-datahub-maps/ or related upload directories with executable extensions
• Web server logs showing POST requests to the plugin's file upload endpoints followed by suspicious GET requests to uploaded files
• Unusual outbound network connections from the web server process

Detection Strategies

• Monitor file system changes in WordPress plugin directories for newly created files with executable extensions (.php, .phtml, .phar)
• Implement web application firewall (WAF) rules to detect file upload attempts with suspicious file types or content
• Review web server access logs for patterns indicating file upload exploitation followed by direct file access
• Deploy endpoint detection to identify web shell behaviors such as command execution through web server processes

Monitoring Recommendations

• Enable file integrity monitoring on WordPress directories to alert on unauthorized file changes
• Configure real-time log analysis for the WordPress admin area and plugin-specific endpoints
• Set up alerts for new user accounts or privilege escalation attempts that could precede exploitation
• Monitor for anomalous process spawning from web server processes (e.g., Apache or Nginx spawning bash or cmd.exe)

How to Mitigate CVE-2026-1730

Immediate Actions Required

• Update the OS DataHub Maps plugin to the latest patched version immediately
• Audit existing files in the plugin's upload directories for any suspicious or unexpected files
• Review WordPress user accounts and remove or reduce privileges for unnecessary Author-level accounts
• Temporarily disable the OS DataHub Maps plugin if an update is not immediately available

Patch Information

A security patch has been released to address this vulnerability. The fix is documented in the WordPress Plugin Changeset. Users should update to a version higher than 1.8.3 to remediate this issue. The patch implements proper file type validation to prevent the upload of dangerous file types.

Workarounds

• Restrict Author-level access to only trusted users until the plugin is updated
• Implement server-level file upload restrictions using .htaccess rules to deny execution of uploaded files
• Use a web application firewall to block requests containing suspicious file upload payloads
• Disable the OS DataHub Maps plugin entirely until a patched version can be deployed

# Apache .htaccess configuration to prevent PHP execution in uploads directory
# Add to wp-content/uploads/.htaccess
<FilesMatch "\.(?:php|phtml|php3|php4|php5|php7|phar)$">
    Order Allow,Deny
    Deny from all
</FilesMatch>