CVE-2026-0890: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component
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.
Other sources
Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 147 - Upgrade
Upgrade
ubuntu/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.7.1+build1-0ubuntu0.22.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.7 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 160.0-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.7.0esr-1~deb12u1Fixed in 140.15.0esr-1~deb13u1Fixed in 153.7.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.7.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.7.0esr-1~deb12u1Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.7.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.7.0esr-1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.7 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 147 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 140.7
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2026-0890?
CVE-2026-0890 is classified as a medium severity vulnerability due to its potential to allow spoofing attacks.
How do I fix CVE-2026-0890?
To resolve CVE-2026-0890, upgrade Firefox to version 147 or Firefox ESR to version 140.7 or later.
What products are affected by CVE-2026-0890?
CVE-2026-0890 affects Firefox versions earlier than 147 and Firefox ESR versions earlier than 140.7.
What type of issue is CVE-2026-0890?
CVE-2026-0890 is a spoofing issue related to the Copy & Paste and Drag & Drop components in the DOM.
When was CVE-2026-0890 disclosed?
CVE-2026-0890 was publicly disclosed as part of Mozilla's ongoing security advisories.