CVE-2024-0673 in Pz-LinkCard Plugin
Summary
by MITRE • 03/28/2024
The Pz-LinkCard WordPress plugin through 2.5.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed
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Analysis
by VulDB Data Team • 04/12/2025
The CVE-2024-0673 vulnerability affects the Pz-LinkCard WordPress plugin version 2.5.1 and earlier, representing a critical cross-site scripting flaw that undermines the security posture of affected WordPress installations. This vulnerability specifically targets the plugin's handling of user settings and configuration parameters, where insufficient sanitization and escaping mechanisms leave the system exposed to malicious code injection attacks. The flaw is particularly concerning because it affects high-privilege users including administrators, who typically have elevated permissions and access to sensitive system functions. The vulnerability exists even when WordPress is configured with unfiltered_html disabled, which normally serves as a protective measure against XSS attacks by restricting HTML input in user-generated content areas. This means that the vulnerability can be exploited even in environments where administrators have taken additional security precautions to prevent malicious script execution.
The technical implementation of this vulnerability stems from the plugin's failure to properly validate and sanitize user input within its settings management interface. When administrators configure plugin options or input data through the WordPress admin panel, the Pz-LinkCard plugin does not adequately process or escape potentially malicious content before storing or rendering it. This creates an environment where attackers with administrative privileges can inject malicious JavaScript code through legitimate plugin configuration fields. The vulnerability operates at the application layer and specifically affects the plugin's settings handling functionality, where user inputs are processed without proper security controls. According to CWE classification, this represents a CWE-79: Cross-Site Scripting vulnerability, which occurs when untrusted data is sent to a web browser without proper validation or sanitization. The attack vector is particularly dangerous because it leverages the elevated privileges of administrators, allowing attackers to execute malicious scripts in the context of the admin's session, potentially leading to complete system compromise.
The operational impact of CVE-2024-0673 extends beyond simple XSS exploitation and can result in severe consequences for affected WordPress installations. An attacker with administrative access can leverage this vulnerability to inject malicious scripts that persist in the plugin's settings or configuration areas. These scripts can then be executed whenever the affected admin panel is accessed, potentially leading to session hijacking, data exfiltration, or further system compromise. The vulnerability's persistence is enhanced because the malicious code is stored within legitimate plugin settings, making it difficult to detect through standard security monitoring. This flaw can enable attackers to perform actions such as creating new admin users, modifying existing user permissions, accessing sensitive data, or installing additional malicious plugins. The ATT&CK framework categorizes this type of vulnerability under T1548.002: Abuse Elevation of Privilege, as it allows attackers to exploit existing administrative access to escalate their capabilities within the WordPress environment. The vulnerability also aligns with T1059.007: Command and Scripting Interpreter: JavaScript, as malicious JavaScript code can be executed directly in the browser context of authenticated users.
Mitigation strategies for CVE-2024-0673 should prioritize immediate plugin updates to versions that address the sanitization and escaping deficiencies. Organizations should ensure that all instances of the Pz-LinkCard plugin are upgraded to the latest available version that contains proper input validation and output escaping mechanisms. Administrators should also implement additional security measures such as regular security audits of plugin configurations, monitoring of admin panel access logs for suspicious activity, and implementation of web application firewalls that can detect and block malicious script injections. The WordPress security team recommends that administrators review their current plugin installations and immediately disable any versions that are vulnerable to this issue. Additionally, organizations should consider implementing strict input validation policies that enforce proper sanitization of all user inputs, particularly in administrative interfaces where privileged users can modify system settings. Security monitoring should include checks for unusual patterns in plugin configuration changes and ensure that all administrative activities are logged and reviewed regularly. The vulnerability highlights the importance of proper input validation and output escaping practices in web applications, particularly for plugins that handle user-provided configuration data, and serves as a reminder that even privileged users should not be granted unrestricted input capabilities without proper security controls in place.