CVE-2025-6057 is a critical vulnerability identified in the WPBookit plugin for WordPress, developed by iqonicdesign. The vulnerability stems from improper validation of uploaded files in the handle_image_upload() function present in all versions up to and including 1.0.4. Specifically, the plugin fails to restrict the types of files that authenticated users with Subscriber-level access or higher can upload. This lack of validation allows an attacker to upload arbitrary files, including potentially malicious scripts or executables, to the web server hosting the WordPress site. Given that WordPress plugins typically run with the privileges of the web server user, successful exploitation can lead to remote code execution (RCE), enabling attackers to execute arbitrary commands, compromise the server, access sensitive data, or pivot further into the network. The vulnerability has a CVSS v3.1 base score of 8.8, indicating high severity, with attack vector being network-based, low attack complexity, requiring only low privileges (authenticated Subscriber-level), no user interaction, and impacting confidentiality, integrity, and availability at a high level. Although no known exploits are currently reported in the wild, the ease of exploitation and the potential impact make this a significant threat to any WordPress site using the affected WPBookit versions. The vulnerability is categorized under CWE-434, which relates to unrestricted file upload vulnerabilities that can lead to code execution or other malicious outcomes.

For European organizations, this vulnerability poses a substantial risk, especially for those relying on WordPress sites with the WPBookit plugin for booking or scheduling functionalities. Exploitation could lead to unauthorized access to sensitive customer data, disruption of services, defacement of websites, or use of compromised servers as a foothold for further attacks within the organization's network. Given the high prevalence of WordPress in Europe across sectors such as e-commerce, education, healthcare, and government, the potential impact includes reputational damage, regulatory non-compliance (e.g., GDPR violations due to data breaches), financial losses, and operational downtime. Attackers exploiting this vulnerability could also leverage compromised servers to launch attacks on other European infrastructure or conduct espionage, increasing the broader cybersecurity risk landscape in the region.

Organizations should immediately audit their WordPress installations to identify the presence of the WPBookit plugin and verify the version in use. If the plugin is installed, it is critical to update to a patched version once available from the vendor. In the absence of an official patch, organizations should consider disabling or uninstalling the plugin to eliminate the attack surface. As a temporary measure, implementing strict web application firewall (WAF) rules to block suspicious file uploads and restrict file types can reduce risk. Additionally, enforcing the principle of least privilege by limiting user roles and permissions, especially restricting Subscriber-level users from uploading files if possible, will mitigate exploitation chances. Monitoring server logs for unusual file upload activity and scanning uploaded files for malware can provide early detection. Finally, organizations should ensure regular backups and have an incident response plan tailored to web server compromises.