CVE-2022-4786 in Video.js Plugin
Summary
by MITRE • 02/21/2023
The Video.js WordPress plugin through 4.5.0 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 • 03/23/2023
The vulnerability identified as CVE-2022-4786 affects the Video.js WordPress plugin version 4.5.0 and earlier, presenting a critical security risk through stored cross-site scripting attacks. This flaw exists within the plugin's shortcode handling mechanism where insufficient input validation and output escaping occurs, creating an attack vector that can be exploited by users possessing contributor-level privileges or higher. The vulnerability specifically targets the plugin's shortcode attributes which are processed and rendered directly back into the web page content without proper sanitization, allowing malicious scripts to be persistently stored and executed within the context of the victim's browser.
The technical implementation of this vulnerability stems from the plugin's failure to properly sanitize user-supplied data within shortcode parameters. When administrators or contributors embed video content using the Video.js shortcode functionality, the plugin accepts attributes such as video URLs, player settings, and other configuration parameters without adequate validation. This lack of sanitization creates a persistent XSS vulnerability where malicious actors can inject script code into these attributes, which then gets stored in the WordPress database and subsequently executed whenever the affected page is rendered to users. The vulnerability's classification aligns with CWE-79 which specifically addresses Cross-Site Scripting flaws in web applications, and it maps to ATT&CK technique T1190 - Exploit Public-Facing Application, demonstrating how attackers can leverage web application vulnerabilities to execute malicious code.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers with contributor privileges to potentially escalate their access within the WordPress environment. Once an attacker successfully injects malicious scripts through the shortcode attributes, they can perform actions such as stealing user sessions, modifying content, redirecting users to malicious sites, or even executing arbitrary commands on the server if additional vulnerabilities exist. The stored nature of the XSS attack means that the malicious code persists in the database and affects all users who view the affected pages, making it particularly dangerous for websites with high user interaction or contributor access. This vulnerability undermines the integrity of the WordPress content management system by allowing unauthorized users to compromise the frontend security posture and potentially access sensitive user data or perform unauthorized modifications to published content.
Mitigation strategies for CVE-2022-4786 should prioritize immediate plugin updates to version 4.5.1 or later, which contain the necessary fixes for the XSS vulnerability. Administrators should also implement additional security measures including restricting contributor privileges to limit the scope of potential attacks, implementing content security policies to prevent script execution, and conducting thorough audit of existing shortcode usage within the WordPress installation. The fix implemented by the plugin developers addresses the core issue by introducing proper input validation and output escaping mechanisms for all shortcode attributes, ensuring that any potentially malicious content is neutralized before being processed or rendered. Security monitoring should include regular scanning for vulnerable plugin versions and implementation of automated patch management systems to prevent similar vulnerabilities from being exploited in the future. Organizations should also consider implementing web application firewalls and input validation layers as additional protective measures against similar stored XSS attacks targeting WordPress environments.