CVE-2026-16378
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DOM-Based Copy & Paste & Drag & Drop Vulnerability in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description
Other issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-24
Generated
2026-08-11
AI Q&A
2026-07-21
EPSS Evaluated
2026-08-09
NVD
CVE-2026-16378
EUVD
EUVD-2026-46214

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla thunderbird to 153.0 (exc)
mozilla firefox to 153.0.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is in Firefox's DOM Copy & Paste and Drag & Drop component. It was fixed in Firefox version 153. The issue could allow unauthorized data manipulation or exfiltration through these DOM interactions.

Detection Guidance

This vulnerability was fixed in Firefox 153, so detecting it involves checking the installed Firefox version. Run 'firefox --version' to verify if your version is below 153. If it is, the system is vulnerable.

Impact Analysis

An attacker could exploit this to steal sensitive data via clipboard or drag-and-drop operations. Users running Firefox versions before 153 are at risk of data theft or unauthorized actions.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a DOM issue in Firefox related to Copy & Paste and Drag & Drop, fixed in Firefox 153.

Mitigation Strategies

Upgrade Firefox to version 153 or later immediately. Use your package manager (e.g., 'apt upgrade firefox' for Debian/Ubuntu) or download the latest version from Mozilla's official website.

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