CVE-2026-93945 in Balance Plugin
Summary
by MITRE • 10/10/2026
Deserialization of Untrusted Data vulnerability in Axiomthemes Balance balance allows Object Injection.This issue affects Balance: from n/a through 1.12.0.
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Analysis
by VulDB Data Team • 10/10/2026
The identified security flaw represents a critical deserialization vulnerability within the Axiomthemes Balance plugin, specifically affecting versions ranging from initial release up to version 1.12.0. This type of vulnerability arises when an application accepts untrusted data and processes it as part of its internal logic without adequate validation or sanitization. In this specific instance, the flaw permits Object Injection, a severe category of insecure deserialization where malicious actors can manipulate serialized objects to execute arbitrary code on the target server. The root cause lies in the plugin's failure to properly validate the integrity and origin of data being passed through its serialization mechanisms, allowing external inputs to be interpreted as executable commands or system-level operations rather than benign user input.
From a technical perspective, insecure deserialization is often categorized under CWE-502, which denotes Deserialization of Untrusted Data. This weakness occurs when an application uses unvalidated and unchecked data from the client side during object reconstruction. In the context of PHP-based WordPress plugins like Balance, this typically involves functions such as unserialize() or similar mechanisms that convert serialized strings back into objects. If these inputs are not strictly controlled, an attacker can craft a malicious payload containing gadget chains—sequences of existing application methods—that trigger unintended behavior when instantiated. This could lead to remote code execution, allowing the attacker to take full control of the web server hosting the vulnerable WordPress instance.
The operational impact of this vulnerability is profound and potentially catastrophic for system administrators and website owners. Successful exploitation allows an unauthenticated or low-privileged user to inject arbitrary PHP objects into the application's processing stream. This can result in complete compromise of the underlying infrastructure, including access to sensitive database credentials, modification of site content, installation of web shells, and use of the compromised server as a pivot point for further attacks within the network. The ability to execute code remotely makes this one of the most dangerous vulnerability classes in web application security, often leading to data breaches, service disruption, and significant reputational damage for affected organizations.
Mitigation strategies must focus on immediate remediation through software updates and enhanced input validation practices. Administrators should upgrade the Axiomthemes Balance plugin to a version later than 1.12.0 as soon as possible, ensuring that the vendor has implemented proper fixes such as strict type checking or whitelisting of allowed classes during deserialization processes. For environments where immediate patching is not feasible, temporary mitigations include implementing Web Application Firewall rules to detect and block known malicious serialization payloads, restricting file upload permissions, and disabling unnecessary PHP functions if possible. Long-term security improvements should involve adopting secure coding standards that avoid native deserialization of untrusted data entirely, preferring safer alternatives like JSON for data interchange whenever applicable.
This vulnerability aligns with the MITRE ATT&CK framework under techniques related to Command and Scripting Interpreter or potentially Execution via Compromise of Application Software, depending on how the injected objects are leveraged by an attacker. Understanding these mappings helps security teams prioritize response efforts based on known adversary behaviors. By addressing this flaw through timely updates and robust input validation, organizations can significantly reduce their attack surface and prevent exploitation of insecure deserialization pathways that have historically been a primary vector for high-severity breaches in web applications.