CVE-2024-8742 is a stored cross-site scripting vulnerability identified in the Essential Addons for Elementor plugin, a popular WordPress extension that provides additional widgets and templates, including the Filterable Gallery widget. The vulnerability arises from insufficient sanitization and escaping of user-supplied input within this widget, allowing authenticated users with contributor-level or higher privileges to inject arbitrary JavaScript code into pages. When other users access these pages, the injected scripts execute in their browsers, potentially enabling session hijacking, privilege escalation, or unauthorized actions within the context of the victim's session. The flaw affects all plugin versions up to and including 6.0.3. The attack vector is remote over the network, with low complexity, but requires authenticated access, and no user interaction is needed beyond page viewing. The vulnerability impacts confidentiality and integrity but does not affect availability. Although no public exploits are known, the widespread use of WordPress and this plugin increases the risk of targeted attacks. The vulnerability is tracked under CWE-79 (Improper Neutralization of Input During Web Page Generation).

The vulnerability allows attackers with contributor-level access to inject persistent malicious scripts into WordPress sites using the affected plugin. This can lead to theft of authentication cookies, enabling session hijacking and impersonation of users with higher privileges, including administrators. Attackers may also perform unauthorized actions on behalf of victims, manipulate site content, or spread malware. The impact is significant for organizations relying on WordPress sites with this plugin, especially those with multiple contributors or editors. Confidentiality and integrity of user data and site content are at risk, potentially damaging reputation and trust. Although availability is not directly impacted, the indirect consequences of compromised accounts or defaced content can disrupt business operations. The medium CVSS score reflects these risks, emphasizing the need for timely remediation.

To mitigate this vulnerability, organizations should immediately update the Essential Addons for Elementor plugin to a version that addresses CVE-2024-8742 once available. Until a patch is released, restrict contributor-level and higher access to trusted users only, minimizing the risk of malicious script injection. Implement a Web Application Firewall (WAF) with rules to detect and block typical XSS payloads targeting the Filterable Gallery widget. Conduct regular security audits of user-generated content and sanitize inputs manually if possible. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. Educate site administrators and contributors about the risks of injecting untrusted content. Monitor logs for unusual activity or signs of exploitation. Finally, maintain regular backups to enable recovery in case of compromise.