CVE-2025-53243 in Employee Directory Plugin
Summary
by MITRE • 08/28/2025
Deserialization of Untrusted Data vulnerability in emarket-design Employee Directory – Staff Listing & Team Directory Plugin for WordPress allows Object Injection. This issue affects Employee Directory – Staff Listing & Team Directory Plugin for WordPress: from n/a through 4.5.3.
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Analysis
by VulDB Data Team • 08/28/2025
This vulnerability represents a critical deserialization flaw in the emarket-design Employee Directory plugin for WordPress, specifically impacting versions through 4.5.3. The issue stems from the plugin's improper handling of untrusted data during object deserialization processes, creating an avenue for malicious actors to inject arbitrary objects into the application's memory space. The vulnerability falls under the CWE-502 category, which specifically addresses deserialization of untrusted data, making it a well-documented and dangerous class of security flaw that has been exploited in numerous high-profile attacks. When a WordPress site utilizes this plugin, any user with sufficient privileges to submit data through the plugin's interfaces can potentially trigger this vulnerability.
The technical execution of this exploit involves manipulating serialized data structures that the plugin processes without adequate validation or sanitization. Attackers can craft malicious serialized objects that, when processed by the vulnerable plugin, execute unintended code within the WordPress environment. This object injection allows for arbitrary code execution, privilege escalation, and potential full system compromise. The vulnerability's impact is amplified because it operates at the serialization layer, meaning that attackers can leverage this weakness to bypass traditional input validation mechanisms that typically protect against injection attacks. The flaw essentially allows an attacker to inject objects that can be executed by the PHP deserialization process, transforming what should be benign data processing into a weaponized attack vector.
The operational implications of this vulnerability are severe for WordPress administrators and site owners. An attacker who successfully exploits this vulnerability can gain complete control over the affected WordPress installation, potentially leading to data breaches, defacement, or the installation of backdoors. The attack surface is particularly concerning because it affects a widely used plugin that many organizations rely on for employee directory functionality. This vulnerability can be exploited remotely without requiring authentication, making it especially dangerous for public-facing WordPress installations. The impact extends beyond immediate compromise to include potential lateral movement within network environments and the possibility of establishing persistent access through the installed backdoors or malware.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The most critical step is to update the affected plugin to version 4.5.4 or later, which contains the necessary patches to prevent deserialization of untrusted data. Administrators should also implement proper input validation and sanitization at all entry points where user data is processed, particularly in serialized data handling. Network-level protections such as web application firewalls and intrusion detection systems can help detect and block exploitation attempts. Additionally, implementing principle of least privilege access controls and regular security audits can reduce the potential impact of successful exploitation attempts. Security teams should also monitor for indicators of compromise related to this vulnerability, including unusual file modifications or unauthorized access patterns in WordPress installations using the affected plugin. Organizations should consider implementing automated patch management processes to ensure timely updates of all WordPress plugins and themes, as this vulnerability demonstrates the importance of keeping all components current with security patches. The ATT&CK framework categorizes this type of vulnerability under T1059.007 for scripting and T1566.001 for spearphishing attachments, highlighting the need for comprehensive defensive strategies that address both the exploitation vector and potential post-compromise activities.