In CVE-2025-10583, the WP Fastest Cache plugin's 'get_server_time_ajax_request' AJAX action does not adequately validate or sanitize user inputs, leading to the SSRF vulnerability. This can be exploited by authenticated attackers, including users with Subscriber-level access. By leveraging this flaw, attackers can route requests through the vulnerable web server to access internal network resources or external hosts. This may permit probing of sensitive infrastructure components or unauthorized interaction with API endpoints, possibly leading to information disclosure or manipulation of internal systems. SSRF vulnerabilities are concerning because they can serve as pivot points for larger attacks against infrastructure that is otherwise invisible to external sources due to firewall or other perimeter controls.

To mitigate this vulnerability, limit AJAX actions to necessary users and ensure all inputs are properly validated and sanitized. Implement additional network-layer security controls to block unauthorized outbound connections from the server, and monitor logs for unusual outgoing traffic patterns from your infrastructure. Furthermore, consider using a Web Application Firewall (WAF) to detect and block malicious request patterns.