CVE-2026-16396

HighCVSS 8.8/10Last modified Oct 24, 2026

Description

Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-269

Affected software

No affected versions have been published.

Timeline

Published
Jul 21, 2026
Last modified
Oct 24, 2026
NVD status
Modified

Related CVEs from 2026

CVE-2026-163976.5Clickjacking issue in the WebExtensions component in Firefox for Android. This vulnerability was fixed in Firefox 153.CVE-2026-163987.5Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-163997.5Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-16404.3The Taskbuilder – WordPress Project Management & Task Management plugin for WordPress is vulnerable to authorization bypass in all versions CVE-2026-164007.5Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-164018.8Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-164029.8Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-164036.5Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-164047.4Spoofing issue in Firefox for Android. This vulnerability was fixed in Firefox 153.CVE-2026-164057.5Information disclosure in the Networking: WebSockets component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, ThunderbirdCVE-2026-164069.1Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-164079.8Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
CVE-2026-16396: High severity, CVSS 8.8 | Vulnix