CVE-2022-4652 in Video Background Plugin
Summary
by MITRE • 03/13/2023
The Video Background WordPress plugin before 2.7.5 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks
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Analysis
by VulDB Data Team • 02/27/2025
The vulnerability identified as CVE-2022-4652 affects the Video Background WordPress plugin version 2.7.4 and earlier, representing a critical stored cross-site scripting weakness that undermines web application security. This flaw resides in the plugin's handling of shortcode attributes within WordPress environments, where the software fails to properly sanitize user input before rendering it back to the browser. The vulnerability specifically targets the plugin's shortcode processing mechanism, which is commonly used to embed video backgrounds into WordPress pages and posts. Attackers exploiting this vulnerability can inject malicious scripts through the plugin's shortcode parameters, which then execute in the browsers of unsuspecting users who view the affected content. The security risk is particularly concerning because it allows users with the contributor role and above to leverage this weakness, indicating that even relatively low-privilege WordPress users can potentially compromise the entire site's security. This represents a significant bypass of WordPress's built-in security controls, as the platform typically restricts contributors from performing actions that could directly impact site integrity or user data.
The technical implementation of this vulnerability stems from insufficient input validation and output escaping within the plugin's shortcode attribute handling code. When users insert video background shortcodes into their posts or pages, the plugin processes various attributes such as video URLs, background settings, and other configuration parameters. The flaw occurs because these attributes are not properly sanitized before being stored in the database and subsequently outputted back to the browser. This creates a classic stored XSS scenario where malicious payloads can persist in the database and execute each time the page containing the shortcode is loaded. The vulnerability maps directly to CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows attackers to inject client-side scripts into web pages viewed by other users. The issue manifests when the plugin's shortcode processing function fails to apply proper HTML escaping or context-appropriate sanitization to user-provided parameters, allowing potentially dangerous characters to be interpreted as executable code rather than plain text.
The operational impact of CVE-2022-4652 extends beyond simple script execution, as it provides attackers with a persistent vector for more sophisticated attacks within the WordPress environment. Once an attacker successfully injects malicious code through the shortcode, they can potentially steal user sessions, redirect visitors to malicious sites, deface content, or even escalate privileges within the WordPress installation. The stored nature of the vulnerability means that the malicious payload remains active until manually removed from the database, allowing attackers to maintain persistent access to the compromised site. This vulnerability is particularly dangerous because it affects the content management system at a fundamental level, potentially enabling attackers to modify or delete content, access sensitive user data, or use the compromised site as a launching point for attacks on other systems. The impact is further amplified by the fact that WordPress contributors typically have access to create and edit posts, making this vulnerability exploitable by users who may not have administrative privileges but still possess significant influence over site content.
Mitigation strategies for CVE-2022-4652 require immediate action to upgrade the Video Background plugin to version 2.7.5 or later, which contains the necessary patches to address the XSS vulnerability. System administrators should also implement additional security measures including comprehensive input validation on all user-submitted content, proper output escaping for all dynamic content, and regular security audits of installed plugins. The WordPress security community recommends maintaining an updated plugin inventory and implementing a robust security monitoring system to detect and respond to potential exploitation attempts. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts, and conduct regular penetration testing to identify similar vulnerabilities in other components of their web infrastructure. The ATT&CK framework categorizes this vulnerability under T1059.008 - Command and Scripting Interpreter: PowerShell, as it enables attackers to execute malicious scripts within the target environment, and T1566.002 - Phishing: Spearphishing Attachment, as attackers may use this vulnerability to deliver malicious payloads through compromised content. Additionally, implementing a web application firewall can provide an additional layer of protection against exploitation attempts while the primary fix is being deployed. Regular security training for content creators and administrators is also crucial to prevent social engineering attacks that might exploit this vulnerability.