CVE-2026-16388

CriticalCVSS 9.8/10Last modified Oct 24, 2026

Description

Sandbox escape in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-693

Affected software

No affected versions have been published.

Timeline

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

Related CVEs from 2026

CVE-2026-163899.8Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153 and ThunderbiCVE-2026-16396.5The Taskbuilder – WordPress Project Management & Task Management plugin for WordPress is vulnerable to time-based blind SQL Injection via thCVE-2026-163909.1Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, anCVE-2026-163917.5Information disclosure in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153CVE-2026-163929.1JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-163939.1Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-163949.1Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-163959.8Integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.CVE-2026-163968.8Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140CVE-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-2026-16388: Critical severity, CVSS 9.8 | Vulnix