CVE-2026-1730 is a vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) affecting the OS DataHub Maps plugin for WordPress, versions up to 1.8.3. The root cause is insufficient validation of uploaded file types within the 'OS_DataHub_Maps_Admin::add_file_and_ext' function, which fails to properly restrict the types of files that authenticated users can upload. This allows attackers with Author-level or higher privileges to upload arbitrary files, including potentially malicious scripts. Because WordPress author roles typically allow content creation and media uploads, an attacker with such access can exploit this vulnerability to place executable files on the server. This can lead to remote code execution (RCE), compromising the confidentiality, integrity, and availability of the affected system. The vulnerability is remotely exploitable over the network without user interaction, and the attack complexity is low since only Author-level privileges are required. No public exploits have been reported yet, but the high CVSS score (8.8) reflects the significant risk posed. The vulnerability affects all versions of the plugin up to 1.8.3, and no patches have been officially released at the time of publication. The plugin is used primarily on WordPress sites that require mapping functionality, which may include government, commercial, and non-profit organizations.

For European organizations, this vulnerability poses a serious threat, especially those relying on WordPress sites with the OS DataHub Maps plugin installed. Successful exploitation can lead to remote code execution, allowing attackers to take full control of the web server, steal sensitive data, deface websites, or use the compromised server as a pivot point for further attacks within the network. This can disrupt business operations, damage reputation, and lead to regulatory non-compliance under GDPR due to potential data breaches. Organizations with multiple content authors or contributors are at higher risk since the attack requires Author-level access, which might be granted to internal users or third-party collaborators. The vulnerability's network-exploitable nature means attackers can attempt exploitation remotely, increasing the attack surface. Additionally, the lack of a patch at the time of disclosure increases exposure duration. The impact extends beyond individual websites to potentially critical infrastructure if such WordPress sites are used in public services or utilities.

Immediate mitigation steps include restricting Author-level user permissions to only trusted individuals and auditing existing users for unnecessary privileges. Organizations should implement strict file upload controls at the web server or application firewall level to block dangerous file types such as executable scripts (.php, .exe, .js). Employing a Web Application Firewall (WAF) with custom rules to detect and block suspicious upload attempts is recommended. Monitoring file system changes and web server logs for unusual activity can help detect exploitation attempts early. Until an official patch is released, consider disabling or removing the OS DataHub Maps plugin if feasible. Alternatively, restrict access to the plugin's upload functionality via IP whitelisting or additional authentication layers. Regular backups and incident response plans should be updated to prepare for potential compromise. Once a patch is available, prioritize immediate application and verify the update's effectiveness through testing.