CVE-2026-0890
Unknown Unknown - Not Provided
DOM Spoofing Vulnerability in Firefox Copy-Paste and Drag-Drop

Publication date: 2026-01-13

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
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Meta Information
Published
2026-01-13
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-14
NVD
CVE-2026-0890
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 147 (exc)
mozilla firefox_esr to 140.7 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-290 This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
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Executive Summary

This vulnerability is a spoofing issue in the Document Object Model (DOM) related to the Copy & Paste and Drag & Drop components in Firefox versions before 147 and Firefox ESR before 140.7. It allows attackers to bypass existing security mitigations within the DOM, potentially enabling unauthorized actions or exploitation within the browser environment. [2]

Impact Analysis

The vulnerability can allow attackers to circumvent security measures in the browser's DOM, which may lead to unauthorized actions or exploitation such as spoofing attacks. This could compromise the integrity of user interactions like Copy & Paste and Drag & Drop, potentially leading to misleading or malicious content being executed or displayed. [2]

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 147 or later, or Firefox ESR to version 140.7 or later, where the issue has been fixed as part of security updates addressing this and other vulnerabilities. [1, 2]

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