CVE-2025-64356 is a security vulnerability identified in the f1logic Insert PHP Code Snippet plugin, affecting all versions up to and including 1.4.3. The vulnerability arises from missing authorization checks within the plugin's functionality that allows insertion of PHP code snippets. Specifically, the plugin fails to enforce proper access control security levels, enabling unauthorized users to exploit this flaw to insert arbitrary PHP code into the hosting WordPress environment. This type of vulnerability is critical because it can lead to remote code execution, allowing attackers to execute malicious code on the server, potentially leading to full system compromise. The vulnerability does not require authentication, meaning any unauthenticated user with access to the vulnerable endpoint could exploit it. No CVSS score has been assigned yet, and no known exploits have been reported in the wild as of the publication date. However, the nature of the vulnerability and the widespread use of WordPress and its plugins make this a significant threat. The lack of patch links suggests that a fix may not yet be available, emphasizing the need for immediate mitigation steps by users of the plugin. The vulnerability was published on October 31, 2025, by Patchstack, a known security researcher and vulnerability aggregator. The absence of CWE identifiers limits detailed classification, but the core issue is a missing authorization control, a common and severe security flaw in web applications.

For European organizations, the impact of CVE-2025-64356 can be severe. Organizations using the Insert PHP Code Snippet plugin in their WordPress sites risk unauthorized code injection, which can lead to remote code execution, data breaches, defacement, or complete site takeover. This can compromise sensitive customer data, intellectual property, and disrupt business operations. The vulnerability's unauthenticated nature increases the attack surface, allowing attackers to exploit it without prior access. This is particularly concerning for sectors with strict data protection regulations such as finance, healthcare, and government agencies within Europe. Additionally, compromised websites can be used as a launchpad for further attacks, including lateral movement within networks or distribution of malware to visitors. The reputational damage and potential regulatory penalties under GDPR for data breaches further amplify the impact. Organizations relying on WordPress for e-commerce, content management, or public-facing services are especially at risk. The lack of an available patch means organizations must rely on configuration changes and monitoring to mitigate risk in the short term.

1. Immediately audit and restrict access controls for the Insert PHP Code Snippet plugin to ensure only trusted administrators can insert PHP code snippets. 2. Temporarily disable or uninstall the plugin if it is not essential to reduce the attack surface until a vendor patch is released. 3. Monitor web server and application logs for unusual POST requests or attempts to insert PHP code snippets, indicating exploitation attempts. 4. Employ Web Application Firewalls (WAF) with custom rules to block unauthorized access to the plugin’s endpoints. 5. Keep WordPress core and all plugins updated regularly; watch for vendor announcements regarding patches for this vulnerability. 6. Implement strict role-based access control (RBAC) within WordPress to limit plugin usage to minimal necessary users. 7. Conduct regular security assessments and penetration testing focusing on plugin vulnerabilities and access control weaknesses. 8. Backup website data and configurations frequently to enable quick recovery in case of compromise. 9. Educate site administrators about the risks of unauthorized code insertion and the importance of plugin security hygiene. 10. Consider alternative plugins with better security track records if the vendor does not provide timely patches.