The vulnerability identified as CVE-2025-13374 affects the Kalrav AI Agent plugin for WordPress, specifically versions up to and including 2.3.3. The root cause is the lack of proper file type validation in the AJAX action 'kalrav_upload_file', which handles file uploads. This missing validation allows unauthenticated attackers to upload arbitrary files, including potentially malicious scripts, to the web server hosting the WordPress site. Since the upload mechanism is accessible without authentication and requires no user interaction, attackers can remotely exploit this vulnerability over the internet. Successful exploitation can lead to remote code execution (RCE), enabling attackers to execute arbitrary commands on the server, compromise the website, steal sensitive data, or use the server as a foothold for further network intrusion. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type), highlighting the risk of dangerous file uploads. The CVSS v3.1 score of 9.8 reflects the critical nature of this vulnerability, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits are currently known, the severity and ease of exploitation make this a high-priority threat. The lack of available patches at the time of reporting increases the urgency for mitigation.

For European organizations, the impact of this vulnerability is severe. Many businesses and institutions rely on WordPress for their web presence, and the Kalrav AI Agent plugin may be used for AI-driven functionalities. Exploitation could lead to full server compromise, resulting in data breaches, defacement of websites, disruption of services, and potential lateral movement within corporate networks. Sensitive customer data, intellectual property, and internal communications could be exposed or manipulated. The availability of the website or service could be disrupted, causing reputational damage and financial losses. Given the critical CVSS score and the unauthenticated nature of the exploit, attackers can easily target vulnerable sites, increasing the risk of widespread attacks across Europe. The threat is particularly concerning for sectors with high regulatory requirements such as finance, healthcare, and government, where data confidentiality and service availability are paramount.

Immediate mitigation steps include disabling the Kalrav AI Agent plugin until a secure patch is released. Organizations should monitor web server logs for unusual file upload activity, especially POST requests to the 'kalrav_upload_file' AJAX endpoint. Implement web application firewalls (WAFs) with custom rules to block or filter suspicious file uploads targeting this endpoint. Restrict file upload permissions on the server to prevent execution of uploaded files, for example by disabling execution rights in upload directories. Employ network segmentation to limit the impact of a compromised web server. Regularly update WordPress core and plugins, and subscribe to vendor security advisories for timely patching. Conduct thorough security audits and penetration tests focusing on file upload functionalities. Educate web administrators about the risks of unrestricted file uploads and the importance of validating file types and content. If patching is not immediately possible, consider using virtual patching techniques via WAFs or reverse proxies to block exploit attempts.