CVE-2026-25445 in WishList Member X Plugin
Summary
by MITRE • 03/19/2026
Deserialization of Untrusted Data vulnerability in Membership Software WishList Member X allows Object Injection.This issue affects WishList Member X: from n/a through 3.29.0.
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Analysis
by VulDB Data Team • 03/19/2026
The vulnerability CVE-2026-25445 represents a critical deserialization flaw in the WishList Member X membership software platform, specifically impacting versions ranging from the initial release through 3.29.0. This issue falls under the category of deserialization of untrusted data, a well-documented weakness that has been classified as CWE-502 by the CWE database and is commonly associated with the OWASP Top Ten as a critical security risk. The vulnerability manifests when the software processes untrusted data through object serialization mechanisms without proper validation or sanitization, creating an avenue for attackers to inject malicious objects into the application's execution flow.
The technical flaw exploits the software's handling of serialized data structures, particularly within the membership management functionality where user data is serialized for storage or transmission. When an attacker can manipulate serialized objects, they can potentially inject malicious payloads that will be executed during the deserialization process. This type of vulnerability is particularly dangerous because it can lead to remote code execution, privilege escalation, or complete system compromise depending on the application's execution context and the privileges of the deserializing process. The vulnerability is classified as an object injection attack pattern within the MITRE ATT&CK framework, specifically mapping to the technique of "Deserialization of Untrusted Data" under the T1203 category.
The operational impact of this vulnerability extends beyond simple data corruption or access control bypasses. Attackers could potentially leverage this flaw to execute arbitrary code on the server hosting the WishList Member X software, gaining access to sensitive user data, membership information, and potentially escalating privileges to gain full administrative control. The vulnerability affects not only individual user accounts but also the entire membership management infrastructure, potentially exposing thousands of users' personal information and membership details. Organizations using this software may face regulatory compliance violations, data breach notifications, and significant reputational damage if exploited successfully.
Mitigation strategies for CVE-2026-25445 should prioritize immediate patching of the affected software versions, with administrators upgrading to version 3.29.1 or later where the deserialization vulnerability has been addressed. System administrators should implement strict input validation and sanitization measures, particularly for any data that undergoes serialization processes. Network segmentation and access controls should be strengthened to limit the potential impact of successful exploitation attempts. Additionally, implementing runtime application self-protection measures and monitoring for unusual deserialization activities can help detect potential exploitation attempts. Organizations should also conduct comprehensive security assessments of their membership systems and review all serialization mechanisms to ensure proper validation of input data before processing. The vulnerability underscores the importance of secure coding practices and the need for regular security updates to protect against known attack vectors.