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.
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Meta Information
Published
2026-05-19
Last Modified
2026-05-20
Generated
2026-06-10
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-08
NVD
EUVD
Affected Vendors & Products
Showing 4 associated CPEs
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
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KEV
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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.
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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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