CVE-2025-64353 is a deserialization of untrusted data vulnerability found in the Polylang plugin for WordPress, developed by Chouby, affecting all versions up to 3.7.3. Deserialization vulnerabilities occur when untrusted input is deserialized by an application, allowing attackers to inject malicious objects that can alter program flow or execute arbitrary code. In this case, the vulnerability enables object injection, which can lead to remote code execution, privilege escalation, or data tampering. The vulnerability requires network access and low privileges (PR:L), but no user interaction (UI:N), making it easier to exploit remotely. The CVSS 3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability, indicating that successful exploitation could fully compromise affected systems. Polylang is widely used for managing multilingual content on WordPress sites, making this vulnerability particularly critical for websites relying on it for content localization. No public exploits are known yet, but the vulnerability's nature and severity suggest attackers could develop exploits rapidly. The lack of available patches at the time of publication necessitates immediate risk mitigation and monitoring. Organizations should be vigilant for suspicious activity related to plugin usage and prepare to deploy patches once released by Chouby or the WordPress plugin repository.

The impact of CVE-2025-64353 on European organizations is significant, especially for those relying on WordPress sites with the Polylang plugin for multilingual content management. Successful exploitation can lead to complete compromise of website confidentiality, integrity, and availability, potentially allowing attackers to execute arbitrary code, steal sensitive data, deface websites, or disrupt services. This can damage organizational reputation, lead to data breaches subject to GDPR penalties, and cause operational downtime. Given the widespread use of WordPress across Europe, including government, educational, and commercial sectors, the vulnerability poses a broad risk. Attackers could leverage this vulnerability to gain footholds in networks, pivot to internal systems, or conduct further attacks such as ransomware deployment. The lack of user interaction requirement and low privilege needed for exploitation increase the risk of automated or widespread attacks. European organizations must consider this vulnerability a high priority for incident prevention and response planning.

1. Immediately audit all WordPress installations to identify the use of Polylang plugin versions up to 3.7.3. 2. Restrict access to WordPress admin and plugin management interfaces to trusted IP addresses and enforce strong authentication mechanisms, including multi-factor authentication. 3. Monitor web server and application logs for unusual deserialization activity or unexpected plugin behavior. 4. Disable or remove the Polylang plugin temporarily if patching is not yet available and multilingual functionality is not critical. 5. Follow Chouby and WordPress plugin repository announcements closely for official patches or updates addressing this vulnerability. 6. Implement Web Application Firewalls (WAF) with custom rules to detect and block suspicious serialized object payloads targeting Polylang endpoints. 7. Conduct regular backups of website data and configurations to enable rapid recovery in case of compromise. 8. Educate site administrators about the risks of plugin vulnerabilities and the importance of timely updates. 9. Consider deploying runtime application self-protection (RASP) solutions to detect and prevent exploitation attempts in real time. 10. Review and harden PHP deserialization handling practices if custom code interacts with Polylang or similar plugins.