CVE-2026-93941 in Edema Plugin
Summary
by MITRE • 10/10/2026
Deserialization of Untrusted Data vulnerability in ThemeREX Group Edema edema allows Object Injection.This issue affects Edema: from n/a through 1.2.2.2.
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Analysis
by VulDB Data Team • 10/10/2026
The identified security flaw represents a critical deserialization vulnerability within the Edema plugin developed by ThemeREX Group, specifically affecting versions ranging from no specified initial version up to release 1.2.2.2. 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 allows for Object Injection, a severe security risk that occurs during the process of reconstructing serialized objects from external input. When an attacker provides maliciously crafted serialized data to the vulnerable component, the application's deserialization mechanism interprets these inputs as legitimate object definitions rather than raw text or structured data. This misinterpretation enables the instantiation of arbitrary PHP objects with properties and methods controlled by the attacker, fundamentally breaking the trust boundary between user input and system execution context.
The technical mechanics behind this vulnerability rely on the inherent dangers associated with insecure deserialization practices in dynamic languages like PHP. Many frameworks utilize serialization to store state or transfer data efficiently, often relying on magic methods such as __wakeup(), __destruct(), or __toString() which are automatically invoked during the unserialization process. If an attacker can control the class name and property values within the serialized payload, they can manipulate these magic methods to execute unintended code paths. This capability transforms a simple data input into a powerful execution vector. The vulnerability is particularly dangerous because it does not require traditional injection techniques like SQLi or XSS; instead, it exploits the application's own logic for handling object states. By chaining multiple gadget classes available within the WordPress environment and its dependencies, an attacker can construct a payload that leads to Remote Code Execution, allowing full compromise of the underlying server infrastructure hosting the vulnerable website.
From an operational perspective, the impact of this vulnerability is severe and multifaceted. Successful exploitation grants attackers unauthorized access to sensitive administrative functions, potentially leading to complete site takeover. This includes the ability to deface web pages, steal user credentials stored in the database, inject malicious scripts for phishing campaigns, or install backdoors that provide persistent access even after initial patches are applied. Furthermore, compromised sites can be leveraged as part of larger botnets for distributed denial-of-service attacks or used to distribute malware to unsuspecting visitors. The presence of such a vulnerability significantly degrades the security posture of any organization relying on Edema for their digital infrastructure, exposing them to regulatory penalties under standards like GDPR if personal data is exfiltrated due to this exploitation vector.
To mitigate these risks and align with industry best practices, immediate remediation actions are required. The primary recommendation is to upgrade the Edema plugin to a version later than 1.2.2.2 where this vulnerability has been addressed by the vendor through input validation and stricter type checking during deserialization processes. For organizations unable to update immediately due to compatibility constraints, implementing strict allowlists for expected object classes can prevent arbitrary class instantiation. Additionally, deploying Web Application Firewalls with rulesets capable of detecting anomalous serialization patterns may provide a layer of defense in depth. It is also crucial to enforce principle of least privilege by ensuring that the web server process runs under restricted user permissions, limiting the potential damage if an exploit succeeds. Regular security audits and code reviews focusing on data handling routines are essential preventive measures against such vulnerabilities.
This vulnerability maps directly to Common Weakness Enumeration identifier CWE-502, which describes Deserialization of Untrusted Data. The exploitation technique aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter execution via system APIs or indirect command invocation, specifically falling under the category of Defense Evasion and Persistence if used to maintain access. Understanding these mappings helps security teams prioritize remediation efforts based on standardized risk frameworks. By addressing this flaw promptly, administrators can eliminate a significant attack surface that could otherwise lead to catastrophic data breaches and operational disruptions. Continuous monitoring for similar patterns in other plugins and themes is advisable to ensure comprehensive protection against insecure deserialization attacks across the entire technology stack.