CVE-2024-0625 in Notification Bar
Summary
by MITRE • 01/25/2024
The WPFront Notification Bar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘wpfront-notification-bar-options[custom_class]’ parameter in all versions up to, and including, 3.3.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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Analysis
by VulDB Data Team • 04/11/2026
The vulnerability identified as CVE-2024-0625 resides within the WPFront Notification Bar plugin for WordPress, representing a critical stored cross-site scripting weakness that undermines web application security. This flaw specifically targets the 'wpfront-notification-bar-options[custom_class]' parameter, which fails to implement adequate input sanitization measures and output escaping mechanisms. The vulnerability affects all versions of the plugin up to and including version 3.3.2, creating a persistent threat vector that can be exploited by malicious actors with administrative privileges. The technical nature of this flaw allows for the injection of arbitrary web scripts that execute whenever users access pages containing the injected content, making it particularly dangerous in multi-site WordPress installations where the impact can cascade across multiple domains within the same network.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with a sophisticated means of executing malicious code within the context of authenticated user sessions. The requirement for administrator-level access to exploit this vulnerability does not diminish its severity, as administrative accounts typically possess elevated privileges that can be leveraged for further compromise. The restriction to multi-site installations and environments where unfiltered_html has been disabled creates a specific attack surface that security professionals must monitor closely, as these configurations represent common WordPress deployment patterns in enterprise and organizational environments. The stored nature of this XSS vulnerability means that the malicious scripts remain persistent in the database, executing every time affected pages are loaded, unlike reflected XSS attacks that require specific user interaction to trigger.
From a security standards perspective, this vulnerability aligns with CWE-79, which defines Cross-Site Scripting as a weakness that allows attackers to inject client-side scripts into web applications. The flaw also corresponds to ATT&CK technique T1566.001, which covers the use of malicious HTML files in phishing attacks, as the injected scripts can serve as delivery mechanisms for more sophisticated attacks. The vulnerability demonstrates poor input validation practices that violate fundamental web application security principles, particularly concerning the handling of user-provided data in contexts where it will be rendered in web browsers. The specific parameter targeted through the custom_class functionality represents a common pattern in WordPress plugin development where user configuration options are not properly sanitized before being stored in the database and subsequently output to web pages.
Mitigation strategies for CVE-2024-0625 must address both immediate remediation and long-term prevention measures. The most critical immediate action involves upgrading to a patched version of the WPFront Notification Bar plugin, as this represents the definitive solution to the vulnerability. Organizations should also implement additional security controls including regular security audits of installed plugins, monitoring for unauthorized administrative access, and implementing content security policies that limit script execution. The vulnerability's requirement for administrator access highlights the importance of implementing robust access controls and multi-factor authentication for administrative accounts. Security teams should also consider implementing web application firewalls to detect and block suspicious parameter values, and conduct regular penetration testing to identify similar vulnerabilities in other plugins and themes. The specific configuration requirements of multi-site installations and disabled unfiltered_html environments suggest that administrators should review their WordPress security configurations and consider implementing additional layers of protection for these specific deployment scenarios.