Attack Chain

1. Attacker identifies a vulnerable endpoint in the Royal Elementor Addons plugin.
2. Attacker crafts a malicious URL containing JavaScript code within a parameter.
3. Attacker delivers the malicious URL to a target user, often through phishing or social engineering.
4. Target user clicks the malicious URL, causing the injected JavaScript to execute in their browser.
5. The injected JavaScript code steals the user’s session cookies or other sensitive information.
6. Attacker uses the stolen cookies to hijack the user’s session and gain unauthorized access to their account.
7. Attacker injects malicious content, such as a fake login form, into the website.
8. Unsuspecting users enter their credentials into the fake form, allowing the attacker to harvest them.

Impact

Successful exploitation of this XSS vulnerability allows attackers to execute arbitrary JavaScript code in the context of a user’s browser. This can lead to account takeover, defacement of websites, or the theft of sensitive information. The number of potential victims is dependent on the number of websites using the vulnerable Royal Elementor Addons plugin. This vulnerability could impact any sector utilizing WordPress and the vulnerable plugin.

Recommendation

• Deploy the Sigma rule detecting XSS attempts against Royal Elementor Addons to your SIEM and tune for your environment.
• Review WordPress logs for suspicious GET or POST requests containing common XSS payloads in the URI or body to identify potential exploitation attempts (log source: webserver).
• Consider using a Web Application Firewall (WAF) to filter out malicious requests targeting this vulnerability.