CVE-2026-110369 in Team Members GS Plugins Plugin
Summary
by MITRE • 10/21/2026
Deserialization of Untrusted Data vulnerability in GS Plugins WordPress Team Members – GS Plugins gs-team-members allows Object Injection.This issue affects WordPress Team Members – GS Plugins: from n/a through 2.8.2.
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Analysis
by VulDB Data Team • 10/21/2026
The vulnerability identified as a deserialization of untrusted data flaw within the GS Plugins WordPress Team Members plugin, specifically affecting versions up to and including 2.8.2, represents a critical security risk that stems from improper handling of serialized PHP objects. This type of vulnerability occurs when an application accepts user-supplied input or external data and passes it directly into a deserialization function without adequate validation or sanitization. In the context of WordPress plugins, this often involves processing parameters passed via HTTP requests, such as POST data, GET variables, or cookies, which are then unserialized to reconstruct PHP objects for further processing by the application logic.
The technical core of this flaw lies in the ability of an attacker to craft a malicious serialized object that exploits specific classes and methods available within the WordPress environment or other loaded plugins. When the vulnerable code executes the deserialization process on this crafted input, it instantiates these objects with properties controlled by the attacker. This mechanism facilitates Object Injection, which is distinct from simple Remote Code Execution in its initial phase but serves as a powerful vector for achieving it. By manipulating object properties and leveraging magic methods such as __wakeup(), __destruct(), or __toString() present in vulnerable classes, an attacker can trigger unintended side effects within the application's runtime environment.
From a classification perspective, this vulnerability aligns with CWE-502, which denotes Deserialization of Untrusted Data. This weakness is particularly dangerous because it allows attackers to bypass normal program flow and execute arbitrary code or perform unauthorized actions by exploiting trusted libraries that are already loaded in memory. The attack vector typically falls under the ATT&CK technique T1190, Exploit Public-Facing Application, as WordPress plugins are frequently exposed to the internet via web servers. Furthermore, if the exploitation leads to remote command execution, it maps to ATT&CK techniques such as T1059 Command and Scripting Interpreter or T1203 Executable File Deployment, depending on how the attacker leverages the injected objects to interact with the underlying operating system.
The operational impact of this vulnerability is severe for any WordPress site running the affected version of GS Team Members. Successful exploitation can lead to full remote code execution on the server hosting the website. This compromise allows attackers to read sensitive files, modify database contents, install backdoors or web shells, and pivot further into the internal network if the server has broader connectivity. Since WordPress sites often contain user data, customer information, and administrative credentials, a successful exploit can result in significant data breaches, regulatory non-compliance, and reputational damage for the site owners. The ease of exploitation means that automated scanning tools commonly found on the dark web or within cybercrime toolkits can easily identify and target vulnerable instances without requiring complex manual interaction.
Mitigation strategies must be implemented immediately to address this risk. The primary and most effective solution is to upgrade GS Team Members to a version newer than 2.8.2, where the developers have presumably patched the deserialization endpoint by implementing strict input validation or removing the use of unsafe unserialization functions on user-controlled data. For sites that cannot be updated immediately due to compatibility constraints with other plugins or themes, temporary mitigations include disabling the plugin entirely if it is not essential for current operations. Additionally, administrators should ensure that their web server configurations restrict access to sensitive files and implement Web Application Firewall rules that can detect patterns associated with PHP object injection attempts, such as specific serialized string formats containing class names followed by method calls or property assignments. Regular security audits and the principle of least privilege in file system permissions also help limit the blast radius should an exploitation attempt succeed.