CVE-2026-3328 is a deserialization vulnerability classified under CWE-502 found in the Frontend Admin by DynamiApps WordPress plugin, affecting all versions up to and including 3.28.31. The root cause is the unsafe use of WordPress's maybe_unserialize() function on the 'post_content' field of admin_form post types, which accepts user-controllable serialized data without restricting allowed classes. This flaw allows authenticated users with Editor-level access or higher to inject crafted PHP objects into the deserialization process. Because the plugin does not enforce class restrictions during deserialization, attackers can leverage PHP Object Injection to execute arbitrary code. The presence of a Property Oriented Programming (POP) gadget chain within the plugin or WordPress environment enables attackers to escalate this injection into remote code execution (RCE), potentially leading to full server compromise. The vulnerability requires no user interaction but does require elevated privileges, making it a significant threat in environments where Editor or higher roles are assigned to potentially untrusted users. Although no known exploits are currently reported in the wild, the vulnerability's characteristics and impact score (CVSS 7.2) highlight the urgency for remediation. The lack of available patches at the time of reporting necessitates immediate risk mitigation strategies.

The vulnerability allows attackers with Editor-level or higher privileges to execute arbitrary PHP code on the affected WordPress server, leading to full compromise of the web application and underlying system. This can result in unauthorized data disclosure, data modification, defacement, installation of backdoors, and lateral movement within the network. Because WordPress is widely used globally, and the Frontend Admin by DynamiApps plugin is designed to enhance administrative interfaces, organizations relying on this plugin face significant risk of privilege escalation and remote code execution attacks. The impact extends to confidentiality, integrity, and availability of affected systems, potentially disrupting business operations and exposing sensitive data. Attackers exploiting this vulnerability could also use compromised servers as pivot points for broader network intrusions or to launch further attacks such as ransomware. The requirement for Editor-level access limits exploitation to insiders or compromised accounts but does not eliminate risk, especially in environments with multiple privileged users or weak access controls.

1. Immediately restrict Editor-level and higher privileges to trusted users only, reviewing and minimizing the number of users with such access. 2. Monitor and audit admin_form post content for suspicious serialized data or unexpected changes. 3. Disable or remove the Frontend Admin by DynamiApps plugin if it is not essential to reduce attack surface. 4. Implement Web Application Firewall (WAF) rules to detect and block suspicious serialized payloads targeting the 'post_content' field. 5. Apply strict input validation and sanitization on serialized data before deserialization, or avoid deserialization of user-controllable data altogether. 6. Follow vendor advisories closely and apply patches or updates as soon as they become available. 7. Employ runtime application self-protection (RASP) or endpoint detection and response (EDR) solutions to detect anomalous PHP execution patterns. 8. Use WordPress security best practices such as limiting plugin usage, enforcing strong authentication, and regular security audits. 9. Consider implementing PHP object deserialization restrictions or hardened PHP configurations to prevent unsafe unserialize() calls. 10. Educate administrators and developers about the risks of unsafe deserialization and privilege misuse.