CVE-2026-93936 in IPharm Plugin
Summary
by MITRE • 10/10/2026
Deserialization of Untrusted Data vulnerability in ThemeREX Group IPharm ipharm allows Object Injection.This issue affects IPharm: from n/a through 1.2.4.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as a deserialization of untrusted data flaw within the ThemeREX Group IPharm plugin represents a critical security risk that stems from the application's handling of serialized objects without adequate validation or integrity checks. In software development, serialization is a mechanism used to convert an object into a byte stream for storage or transmission, while deserialization reverses this process to reconstruct the original object in memory. When an application accepts data from external sources and directly passes it to a deserialization function without verifying its origin or content, it creates an opening for attackers to inject maliciously crafted serialized objects. In the specific context of IPharm versions ranging from n/a through 1.2.4, this architectural weakness allows remote attackers to perform object injection attacks by supplying specially formatted input that exploits internal PHP deserialization mechanisms.
The technical core of this vulnerability lies in the lack of strict type checking and whitelisting for classes allowed during the unserialization process. When a user submits data containing serialized payloads, typically via HTTP parameters or file uploads processed by the plugin, the application attempts to reconstruct these objects into native PHP structures. If the deserialization logic does not restrict which class constructors are invoked, an attacker can craft a payload that instantiates arbitrary classes with malicious side effects. This often involves leveraging publicly available gadget chains—sequences of existing methods within the WordPress core or other installed plugins—that perform dangerous operations such as file system access, remote code execution, or database manipulation when triggered during object construction or destruction phases like __destruct() or __wakeup().
The operational impact of this vulnerability is severe, potentially leading to full server compromise. An attacker who successfully exploits this flaw can execute arbitrary commands on the underlying web server with the privileges of the web application process. This level of access allows for the exfiltration of sensitive patient data stored in the WordPress database, modification of website content, installation of backdoors or malware such as cryptominers and ransomware, and use of the compromised host as a pivot point to attack other systems within the network infrastructure. Given that IPharm is designed for healthcare-related themes, the breach also carries significant regulatory implications regarding patient privacy laws like HIPAA in the United States or GDPR in Europe, due to the potential exposure of protected health information.
This vulnerability aligns with CWE-502, which describes Deserialization of Untrusted Data, a category of flaws where applications fail to validate data before deserializing it, leading to remote code execution or other unintended behaviors. From an offensive security perspective, this attack vector is categorized under MITRE ATT&CK technique T1190, Exploit Public-Facing Application, as the vulnerability resides in software accessible over a network and can be exploited without prior authentication if input fields are not properly secured. The exploitation typically involves crafting serialized PHP objects that traverse through available gadget chains to achieve code execution, often requiring no user interaction beyond submitting malicious form data or manipulating request parameters exposed by the plugin's interface.
Mitigation strategies must focus on immediate remediation and long-term defensive coding practices. The primary recommendation is for administrators of sites using IPharm versions up to 1.2.4 to update the plugin immediately if a patched version has been released by ThemeREX Group, or alternatively, to disable and delete the plugin until an official fix is available. For developers implementing similar functionality in future projects, it is imperative to avoid native PHP deserialization functions like unserialize() when processing untrusted input entirely. Instead, applications should use safe data interchange formats such as JSON for serialization purposes, which do not support arbitrary object instantiation. If complex objects must be serialized and transmitted, strict whitelisting of allowed classes during the deserialization process using a custom handler or library that restricts class names is essential to prevent gadget chain exploitation. Additionally, implementing input validation frameworks that sanitize all user-supplied data before processing can further reduce the attack surface associated with such vulnerabilities.