CVE-2025-12775 is a vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) affecting the WP Dropzone plugin for WordPress. The flaw exists in the plugin's chunked upload functionality, specifically within the ajax_upload_handle function, which writes uploaded file chunks directly to the server's uploads directory before performing any file type validation. This sequence allows authenticated users with subscriber-level privileges or higher to upload arbitrary files, including potentially malicious scripts. Because the files are placed in a web-accessible directory, attackers can leverage this to execute remote code on the server, compromising the site's confidentiality, integrity, and availability. The vulnerability affects all versions up to and including 1.1.0 of WP Dropzone. The CVSS v3.1 score of 8.8 indicates a high severity, with an attack vector over the network, low attack complexity, requiring privileges (PR:L), no user interaction, and impacting confidentiality, integrity, and availability. Although no public exploits have been reported yet, the vulnerability's nature and ease of exploitation by authenticated users make it a critical concern for WordPress sites using this plugin. The vulnerability was published on November 18, 2025, and no patches have been linked yet, emphasizing the need for immediate attention from site administrators.

For European organizations, this vulnerability poses a significant threat, especially for those relying on WordPress websites with the WP Dropzone plugin installed. Successful exploitation can lead to remote code execution, allowing attackers to gain control over web servers, steal sensitive data, deface websites, or use compromised servers as a foothold for further network intrusion. This can disrupt business operations, damage reputations, and lead to regulatory non-compliance, particularly under GDPR, which mandates protection of personal data. Organizations with subscriber-level user roles exposed to the internet are at increased risk, as attackers only need such access to exploit the vulnerability. The impact extends to e-commerce platforms, government portals, and media sites prevalent across Europe, where WordPress is widely used. Additionally, compromised sites can be used to distribute malware or launch attacks against other targets, amplifying the threat landscape.

Immediate mitigation steps include disabling the WP Dropzone plugin until a security patch is released. Administrators should restrict upload permissions strictly to trusted users and review user roles to minimize subscriber-level access where not necessary. Implementing web application firewalls (WAFs) with rules to detect and block suspicious file uploads can provide additional protection. Monitoring upload directories for unexpected file types and conducting regular file integrity checks can help detect exploitation attempts early. Once a patch becomes available, prompt updating of the plugin is critical. Additionally, hardening the WordPress environment by disabling PHP execution in upload directories and employing least privilege principles for user accounts will reduce the risk of remote code execution. Regular security audits and user activity monitoring are recommended to identify and respond to potential breaches swiftly.