CVE-2024-3819 is a stored Cross-Site Scripting vulnerability identified in the Jeg Elementor Kit WordPress plugin, specifically within the JKit - Banner widget component. The vulnerability arises from improper neutralization of input during web page generation (CWE-79), where user-supplied attributes are not adequately sanitized or escaped before being rendered. This flaw allows authenticated attackers with contributor-level permissions or higher to inject arbitrary JavaScript code into pages managed by the plugin. When other users, including administrators or visitors, access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, defacement, or unauthorized actions performed on behalf of the victim. The vulnerability affects all versions up to and including 2.6.4 of the plugin. The CVSS 3.1 base score is 6.4, indicating a medium severity level, with the vector AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N, meaning the attack can be performed remotely over the network with low attack complexity but requires privileges (contributor or above), no user interaction is needed, and the scope is changed due to impact on other users. No patches or fixes are currently linked, and no known exploits have been reported in the wild, but the risk remains significant due to the widespread use of WordPress and the plugin's functionality in site content management.

The impact of this vulnerability is primarily on the confidentiality and integrity of data on affected WordPress sites. Attackers with contributor-level access can inject malicious scripts that execute in the browsers of site visitors and administrators, potentially leading to theft of session cookies, redirection to malicious sites, unauthorized actions performed with elevated privileges, or defacement of the website. This can damage the reputation of organizations, lead to data breaches, and compromise user trust. Since the vulnerability requires authenticated access, the risk is somewhat mitigated by the need for an attacker to have at least contributor permissions, but in many WordPress environments, contributor roles are common or can be compromised. The vulnerability does not affect availability directly but can indirectly cause service disruption through malicious payloads or administrative lockout. Organizations relying on the Jeg Elementor Kit plugin for content presentation are at risk, especially those with multiple contributors or less stringent access controls.

To mitigate CVE-2024-3819, organizations should first check for updates from the Jegtheme vendor and apply any available patches promptly once released. In the absence of an official patch, administrators should restrict contributor-level permissions to trusted users only and audit existing user roles for unnecessary privileges. Implementing a Web Application Firewall (WAF) with rules to detect and block typical XSS payloads targeting the plugin's banner widget can reduce exploitation risk. Additionally, site administrators should review and sanitize all user-generated content manually or via plugins that enforce strict input validation and output escaping. Monitoring logs for suspicious activity related to the banner widget and conducting regular security assessments on WordPress installations can help detect exploitation attempts early. Finally, educating contributors about safe content practices and the risks of injecting untrusted code is essential to prevent accidental exploitation.