CVE-2026-16371 is a moderate-impact privilege escalation vulnerability in the DOM: Navigation component of Mozilla Firefox. It was fixed in Firefox 153 and Firefox ESR 140.13 as part of a security update that addressed numerous vulnerabilities. The flaw could allow an attacker to escalate privileges within the browser context. The Mozilla advisory confirms the fix and provides references to the bug report. There are no reports of active exploitation in the wild for this specific vulnerability.

The vulnerability enables privilege escalation in the DOM: Navigation component, which could allow an attacker to gain elevated privileges within the Firefox browser environment. This could potentially lead to unauthorized actions or access within the browser. However, no active exploitation in the wild has been reported, and the impact is rated as moderate by the vendor.

Mozilla has released official fixes for this vulnerability in Firefox 153 and Firefox ESR 140.13. Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is fixed in these releases, no additional mitigation steps are required beyond applying the official update.