CVE-2025-11967 is a vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) affecting the Mail Mint WordPress plugin, which is used for newsletters, email marketing, automation, WooCommerce emails, and post notifications. The vulnerability arises from the process_contact_attribute_import function, which lacks proper validation of uploaded file types. This flaw allows authenticated users with administrator privileges or higher to upload arbitrary files to the server. Because the plugin does not restrict file types during the upload process, attackers can upload malicious files such as web shells or scripts that could be executed remotely, leading to remote code execution (RCE). The vulnerability affects all versions up to and including 1.18.10. The CVSS 3.1 base score is 7.2, indicating a high severity level, with an attack vector of network (remote), low attack complexity, requiring high privileges (administrator), no user interaction, and impacts on confidentiality, integrity, and availability. Although no public exploits have been reported yet, the potential for exploitation is significant due to the ease of uploading arbitrary files once authenticated. This vulnerability is particularly dangerous because WordPress sites often run with elevated privileges and are accessible over the internet, making successful exploitation a critical risk. The lack of a patch link suggests that a fix may not yet be publicly available, emphasizing the need for immediate mitigation steps.

For European organizations, the impact of this vulnerability can be severe. Organizations using the Mail Mint plugin for managing newsletters, email marketing, and WooCommerce-related communications could face unauthorized server access, data breaches, defacement, or service disruption. The ability to upload arbitrary files could lead to remote code execution, allowing attackers to install backdoors, steal sensitive customer data, manipulate marketing campaigns, or disrupt e-commerce operations. This could result in financial losses, reputational damage, regulatory penalties under GDPR, and operational downtime. Given the widespread use of WordPress and WooCommerce in Europe, especially among SMEs and e-commerce businesses, the attack surface is substantial. Organizations with weak internal access controls or shared hosting environments are at higher risk. The requirement for administrator-level access limits the attack vector to insiders or compromised credentials, but phishing or credential stuffing attacks could facilitate this. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as threat actors often develop exploits rapidly after disclosure.

1. Immediately review and restrict administrator access to the WordPress backend to trusted personnel only, enforcing strong authentication mechanisms such as MFA. 2. Monitor and audit file uploads and server directories for suspicious or unauthorized files, especially in locations used by the Mail Mint plugin. 3. Apply the official patch or update the Mail Mint plugin to a fixed version as soon as it becomes available. 4. In the absence of a patch, implement web application firewall (WAF) rules to block file uploads with dangerous extensions or unexpected content types. 5. Harden the server environment by disabling execution permissions in upload directories to prevent execution of uploaded malicious files. 6. Regularly back up website data and configurations to enable quick recovery in case of compromise. 7. Conduct internal security awareness training to reduce the risk of credential compromise leading to administrator access. 8. Use intrusion detection systems to identify anomalous activities related to file uploads or administrative actions. 9. Consider isolating the WordPress environment or using containerization to limit the blast radius of potential exploitation. 10. Engage with the plugin vendor or community to stay informed about patch releases and vulnerability disclosures.