CVE-2026-96343 in ERP Plugin
Summary
by MITRE • 09/30/2026
Custom role PHP Object Injection in WP ERP <= 1.17.9 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as Custom Role PHP Object Injection within WordPress Enterprise Resource Planning (WP ERP) plugins prior to version 1.17.9 represents a critical server-side code execution risk stemming from improper handling of user-supplied input during the serialization and deserialization processes. This flaw is fundamentally rooted in CWE-502, which denotes Deserialization of Untrusted Data, allowing an attacker to manipulate PHP object instances by injecting malicious serialized payloads into parameters that are subsequently passed through unvalidated functions such as unserialize or similar mechanisms within the plugin's custom role management logic. The vulnerability arises because the application fails to validate the integrity and type of data received from authenticated users with specific capabilities, thereby trusting input that can be crafted to instantiate arbitrary PHP objects with side effects when their magic methods are invoked during the deserialization process.
From a technical perspective, this exploitation vector leverages the inherent flexibility of PHP's object-oriented architecture where certain classes contain magic methods like __wakeup or __destruct that execute code automatically upon instantiation. By crafting a serialized string that references these vulnerable classes and injecting it into the custom role configuration parameters, an attacker can trigger unintended method calls within the application context. This typically requires at least low-privilege authentication on the WordPress site, as the vulnerability is tied to the management of user roles and capabilities which are generally restricted to administrators or users with specific editing permissions. The attack does not rely on external network services but rather exploits the internal logic flow where input from HTTP requests is directly processed without sufficient sanitization checks against known dangerous classes or methods defined in WordPress core or other active plugins, creating a chain of execution that leads to arbitrary code execution under the context of the web server process.
The operational impact of this vulnerability is severe, as successful exploitation allows an attacker to achieve Remote Code Execution (RCE) on the compromised host system. This level of access enables the complete compromise of the underlying WordPress installation and potentially the broader network infrastructure if the web server has elevated privileges or connectivity to other internal systems. Attackers can use this foothold to exfiltrate sensitive data, including customer records stored in the ERP module, database credentials, and administrative session tokens. Furthermore, it facilitates persistent backdoor installations, allowing for long-term unauthorized access even after initial detection efforts are undertaken by security teams. The ability to execute arbitrary code also means that attackers can pivot from this web application vulnerability to attack other services running on the same host or network segment, significantly expanding the blast radius of the incident beyond just the WordPress environment itself.
In terms of industry standard mapping, this vulnerability aligns with MITRE ATT&CK technique T1059 Command and Scripting Interpreter, specifically PHP scripting, as it involves executing system commands through injected code. It also relates to T1190 Exploit Public-Facing Application if the entry point is accessible via web interfaces without sufficient access controls. The root cause falls squarely under CWE-20 Improper Input Validation and CWE-502 Deserialization of Untrusted Data, highlighting a failure in both input sanitization and secure coding practices regarding object lifecycle management. Security researchers emphasize that such vulnerabilities are often exacerbated by the use of legacy code patterns or third-party libraries that do not adhere to modern security standards for data handling.
To mitigate this risk, organizations must immediately upgrade WP ERP to version 1.17.9 or later where these input validation checks have been implemented and tested. In addition to patching, it is crucial to enforce strict least-privilege principles by ensuring that only trusted administrators can access role management features and implementing Web Application Firewall rules that detect patterns associated with PHP object injection payloads in HTTP request parameters. Regular security audits focusing on deserialization practices across all installed plugins are recommended to identify similar vulnerabilities before they can be exploited. Monitoring server logs for unusual activity related to file inclusion or unexpected process executions can also aid in early detection of exploitation attempts, providing a defense-in-depth strategy that complements the primary fix of updating software components.