CVE-2026-8962

Analyzed Analyzed - Analysis Complete

DOM Security Bypass in Firefox

Publication date: 2026-05-19

Last updated on: 2026-05-20

Assigner: Mozilla Corporation

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-19

Last Modified

2026-05-20

Generated

2026-06-30

AI Q&A

2026-05-19

EPSS Evaluated

2026-06-28

NVD

CVE-2026-8962

EUVD

EUVD-2026-30911

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 151.0.0 (exc)
mozilla	firefox	to 140.11.0 (exc)
mozilla	thunderbird	to 140.11 (exc)
mozilla	thunderbird	to 151.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

This vulnerability is a mitigation bypass in the DOM (Document Object Model) security component of Mozilla Firefox. It means that a security measure designed to protect the DOM was circumvented, potentially allowing an attacker to exploit the browser in ways that were previously prevented.

The issue was addressed and fixed in Firefox version 151 and Firefox ESR 140.11.

Impact Analysis

Exploitation of this vulnerability could allow attackers to bypass security protections in the browser's DOM, potentially leading to unauthorized actions such as executing malicious scripts or accessing sensitive information within the browser context.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 151 or later, or Firefox ESR to version 140.11 or later.

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