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5.4 Medium

CVE-2026-0890 Spoofing issue in the DOM: Copy & Paste and Drag & Drop component

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.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 147	earliest → < 147	147
Firefox 140.7	earliest → < 140.7	140.7
Firefox ESR 140.7	earliest → < 140.7	140.7
Thunderbird 147	earliest → < 147	147
Thunderbird 140.7	earliest → < 140.7	140.7

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published January 13, 2026
Last modified April 13, 2026

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