CVE-2026-57371 in WPJAM Basic Plugin
Summary
by MITRE • 07/13/2026
Deserialization of Untrusted Data vulnerability in denishua WPJAM Basic wpjam-basic allows Object Injection.This issue affects WPJAM Basic: from n/a through <= 7.0.
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Analysis
by VulDB Data Team • 07/13/2026
The deserialization of untrusted data vulnerability in denishua WPJAM Basic wpjam-basic represents a critical security flaw that enables object injection attacks through improper input validation and sanitization mechanisms. This vulnerability specifically impacts versions of the plugin ranging from the initial release through version 7.0, creating a persistent threat vector that could be exploited by malicious actors to execute arbitrary code on affected WordPress installations. The issue stems from the plugin's failure to properly validate and sanitize serialized data received from user inputs or external sources, allowing attackers to inject malicious objects that can be deserialized during normal plugin operations.
The technical flaw manifests when the wpjam-basic plugin processes serialized PHP objects without adequate security measures to prevent manipulation of object state or execution of unintended code. This type of vulnerability falls under the CWE-502 category, which specifically addresses deserialization of untrusted data as a means for executing arbitrary code through object injection attacks. The vulnerability creates an attack surface where malicious actors can craft serialized objects containing malicious payloads that, when processed by the vulnerable plugin, result in unauthorized code execution with the privileges of the web server. This represents a significant elevation of privilege risk that could allow attackers to gain full control over affected systems.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data breach potential. Attackers exploiting this vulnerability can manipulate the plugin's functionality to perform unauthorized actions such as accessing sensitive user data, modifying content, installing backdoors, or using the compromised system as a pivot point for further attacks within the network. The attack vector typically involves sending malicious serialized data through HTTP requests or other input mechanisms that the plugin accepts and processes without proper validation. This vulnerability directly aligns with ATT&CK technique T1059.007, which covers the use of PHP for executing commands, and represents a common pathway for attackers to establish persistent access to WordPress environments.
Mitigation strategies for this vulnerability require immediate action including updating to the latest version of WPJAM Basic where the deserialization issue has been addressed through proper input validation and sanitization. System administrators should implement comprehensive monitoring of plugin usage patterns and network traffic for suspicious serialized data patterns that could indicate exploitation attempts. Additional protective measures include restricting plugin file permissions, implementing web application firewalls with rules specifically designed to detect and block malicious serialization patterns, and conducting thorough security audits of all installed plugins to identify similar vulnerabilities. The vulnerability also highlights the importance of following secure coding practices such as avoiding direct deserialization of untrusted data and implementing proper input validation at multiple layers of application architecture to prevent similar issues from occurring in other components of the WordPress ecosystem.