CVE-2026-6762

Received Received - Intake

DOM Spoofing Vulnerability in Firefox Core & HTML Components

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description

Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-21

Last Modified

2026-04-22

Generated

2026-07-06

AI Q&A

2026-04-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6762

EUVD

EUVD-2026-24103

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 150.0 (exc)
mozilla	firefox	to 140.10.0 (exc)
mozilla	thunderbird	From 140.0 (inc) to 140.10.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-290	This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Attack-Flow Graph

Executive Summary

This vulnerability is a spoofing issue found in the DOM: Core & HTML component of Mozilla Firefox. It allows an attacker to potentially deceive users by manipulating the Document Object Model (DOM) in a way that misrepresents content or origin.

The issue was addressed and fixed in Firefox versions 150, Firefox ESR 115.35, and Firefox ESR 140.10.

Impact Analysis

This spoofing vulnerability could allow attackers to trick users by displaying misleading or falsified web content, potentially leading to phishing attacks or other forms of social engineering.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 150 or later, or update Firefox ESR to versions 115.35 or 140.10 or later where the issue has been fixed.

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