CVE-2026-16366

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.8 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H                                    

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Published Date

July 21, 2026

Last Modified

July 22, 2026

CWE ID

CWE-269

Source

NVD

Vendor

Mozilla

Product

Firefox