CVE-2026-108291 in Affiliates Plugin
Summary
by MITRE • 10/14/2026
Deserialization of Untrusted Data vulnerability in itthinx Affiliates affiliates allows Object Injection.This issue affects Affiliates: from n/a through 7.0.1.
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Analysis
by VulDB Data Team • 10/14/2026
The identified security flaw represents a critical deserialization of untrusted data vulnerability within the itthinx Affiliates plugin for WordPress, specifically affecting versions ranging from initial releases up to version 7.0.1. This category of vulnerability arises when an application accepts serialized objects from external sources and processes them without adequate validation or sanitization. In this specific context, the flaw allows for Object Injection, a severe security issue where an attacker can manipulate the deserialization process to instantiate arbitrary PHP objects with controlled properties. Unlike simple code execution vulnerabilities that rely on direct input injection into eval functions, object exploitation leverages existing classes within the application environment or included libraries to perform malicious actions through their built-in methods and magic functions such as __wakeup(), __destruct(), or __toString().
The technical mechanism behind this vulnerability involves the improper handling of data passed during affiliate tracking or management operations. When a user interacts with the plugin, potentially via specially crafted URLs containing serialized payload data, the application attempts to unserialize this input directly into PHP objects. Because the deserialization function does not verify that the incoming data originates from a trusted source or matches an expected structure, it permits the creation of unintended object instances. An attacker can craft a malicious serialized string that defines properties and methods leading to remote code execution, privilege escalation, or unauthorized access to sensitive administrative functions. This exploitation path is particularly dangerous because it often bypasses standard input validation checks that focus on text strings rather than complex data structures like PHP arrays or objects.
From an operational impact perspective, the successful exploitation of this vulnerability grants attackers significant control over the compromised WordPress instance. Depending on the capabilities available in the loaded classes and the current user privileges associated with the deserialization context, an attacker could achieve full remote code execution on the web server hosting the application. This level of access allows for complete compromise of the underlying system, including the ability to read, modify, or delete files, install backdoors, pivot into internal networks, and exfiltrate sensitive data such as user credentials, financial records associated with affiliate commissions, and database contents. The impact is exacerbated by the widespread use of WordPress in e-commerce environments where affiliate marketing is common, potentially exposing multiple businesses to risk if they rely on this vulnerable plugin version.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-502, which describes Deserialization of Untrusted Data. It also maps to several techniques within the MITRE ATT&CK framework for enterprise security, specifically T1059 Command and Scripting Interpreter through PHP execution capabilities derived from object manipulation, and potentially T1136 if used to create fake user accounts or modify existing ones for persistent access. The exploitation often involves crafting specific payloads that exploit magic methods in WordPress core classes or third-party libraries included by the plugin, turning benign functionality into a vector for arbitrary code execution.
Mitigation strategies must prioritize immediate remediation due to the severity of remote code execution risks associated with this flaw. Administrators running versions of itthinx Affiliates from n/a through 7.0.1 should update the plugin to version 7.0.2 or later, where the deserialization logic has been hardened to validate input sources and restrict object instantiation to safe, expected types only. In environments where immediate patching is not feasible due to compatibility constraints, temporary mitigations include disabling PHP execution in upload directories if applicable, implementing strict Web Application Firewall rules that detect patterns associated with serialized payload injection such as O: or a:, and restricting file permissions to prevent write access by the web server user wherever possible. Continuous monitoring of application logs for unusual deserialization errors or unexpected object instantiations can also aid in early detection of exploitation attempts while permanent fixes are deployed.