CVE-2026-62045 in Booklovers Plugin
Summary
by MITRE • 10/10/2026
Deserialization of Untrusted Data vulnerability in ThemeREX Group Booklovers booklovers allows Object Injection.This issue affects Booklovers: from n/a through 2.13.0.
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Analysis
by VulDB Data Team • 10/10/2026
The identified security flaw represents a critical deserialization of untrusted data vulnerability within the Booklovers plugin developed by ThemeREX Group, specifically affecting versions ranging from initial releases up to version 2.13.0. This category of vulnerability is fundamentally rooted in the application's failure to properly validate or sanitize input before processing it through PHP serialization mechanisms. When an application accepts serialized objects from external sources without rigorous integrity checks, it creates a pathway for attackers to inject malicious payloads that manipulate internal object states upon deserialization. In this specific instance, the flaw allows for Object Injection, which is a severe security risk because it bypasses standard access controls and can lead to arbitrary code execution or significant system compromise depending on the available gadget chains within the PHP environment.
From a technical perspective, the vulnerability likely stems from functions such as unserialize being called with data derived directly from user input, cookies, HTTP headers, or database entries without adequate sanitization. The attacker crafts a serialized string containing a malicious object that targets specific classes and methods present in the WordPress core or other installed plugins. Upon deserialization, these objects trigger side effects defined within their magic methods, such as __wakeup, __destruct, or __toString. This process allows the injection of arbitrary logic into the application's execution flow. The impact is particularly severe because it grants the attacker a high degree of control over the server environment, potentially leading to remote code execution, data exfiltration, defacement, or complete system takeover if the web service runs with elevated privileges.
The operational impact of this vulnerability extends beyond immediate technical compromise to include significant reputational and financial damage for site administrators relying on Booklovers. Successful exploitation can result in unauthorized access to sensitive customer data stored within the WordPress database, including personal information and transaction records. Furthermore, attackers may use the compromised server as a pivot point for further attacks against other services or networks. The presence of such a vulnerability undermines user trust and exposes organizations to regulatory penalties under frameworks like GDPR if personal data is breached due to inadequate security controls.
To mitigate this risk, immediate action is required by upgrading the Booklovers plugin to a version later than 2.13.0 where the issue has been resolved through proper input validation and secure deserialization practices. Administrators should also implement Web Application Firewalls configured with rulesets capable of detecting serialized payload patterns associated with common gadget chains. Additionally, enforcing strict Content Security Policies and disabling unnecessary PHP functions can reduce the attack surface. Regular security audits and code reviews focusing on data handling processes are essential to prevent similar vulnerabilities in future updates or other plugins within the ecosystem.
This vulnerability is classified under CWE-502, which denotes Deserialization of Untrusted Data, highlighting the critical nature of validating input before processing it into executable objects. In terms of offensive security tactics, this flaw aligns with MITRE ATT&CK technique T1190, Exploit Public-Facing Application, as well as T1059, Command and Scripting Interpreter, if the deserialization leads to arbitrary code execution. Understanding these classifications helps in prioritizing remediation efforts based on industry-standard risk assessments and ensures that security teams address both the immediate technical flaw and its broader implications for system integrity.