CVE-2026-92030
Received Received - Intake

DOM Clobbering Mitigation Bypass in Firefox

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: Mozilla Corporation

Description
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-92030
EUVD
EUVD-2026-78493

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 156
mozilla firefox_esr 140.16
mozilla firefox_esr 153.3

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a mitigation bypass in Firefox's DOM Copy & Paste and Drag & Drop component. It allows attackers to bypass security measures in these features, potentially enabling unauthorized data access or manipulation.

Detection Guidance

This vulnerability is specific to Firefox versions before 156, Firefox ESR before 140.16, and Firefox ESR before 153.3. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'about:support' in Firefox. Compare the version against the patched releases.

Impact Analysis

If exploited, this vulnerability could allow attackers to bypass security restrictions when copying, pasting, or dragging and dropping data in Firefox. This might lead to unauthorized data exfiltration or injection of malicious content.

Mitigation Strategies

Update Firefox to version 156 or later, Firefox ESR to version 140.16 or later, or Firefox ESR to version 153.3 or later to address the DOM Copy & Paste and Drag & Drop component vulnerability.

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