CVE-2026-0890

Spoofing issue in the DOM: Copy & Paste and Drag & Drop component

State: Published
Severity: 5.4 Medium
Published: Jan 13, 2026
Updated: Apr 13, 2026
Reserved: Jan 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L	CISA-ADP

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
FirefoxMozilla	140.7 through 140.*Not affected 147 and laterNot affected
ThunderbirdMozilla	140.7 through 140.*Not affected 147 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2005081
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://www.mozilla.org/security/advisories/mfsa2026-05/

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