Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151.
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.
Mozilla Firefox < 151
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import os
# Conceptual PoC for CVE-2026-8952
# This script simulates checking if the update directory is writable,
# which is a prerequisite for exploiting the privilege escalation vulnerability.
def check_firefox_update_vuln():
# Path to the Firefox update directory (example for Windows)
target_path = r"C:\Program Files\Mozilla Firefox\update"
print(f"[*] Checking permissions for: {target_path}")
if not os.path.exists(target_path):
print("[!] Firefox update directory not found.")
return
# Check if the current user has write access
if os.access(target_path, os.W_OK):
print("[+] VULNERABLE: Write access detected in update directory.")
print("[+] An attacker could potentially exploit the update service for privilege escalation.")
else:
print("[-] Secure: No write access detected with current privileges.")
if __name__ == "__main__":
check_firefox_update_vuln()