Name: CVE-2026-2784: Authentication Bypass Using an Alternate Path or Channel
Creator: Rapid7
Published: 2026-02-24T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-2784, CVSS 9.8, EPSS 0.00549

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS Details

CVSS 3.1 Base Score: 9.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade thunderbirdUpgrade firefox-x11Upgrade firefox	Feb 27, 2026	Feb 25, 2026
Amazon Linux Ami 2	—	Upgrade firefoxUpgrade thunderbird	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox	Mar 27, 2026	Feb 24, 2026
Debian	—	Upgrade firefox-esrUpgrade thunderbird	Feb 27, 2026	Feb 27, 2026
Mfsa2026 13	—	Upgrade to Mozilla Firefox version 148.0Upgrade to the latest version of Mozilla Firefox	Feb 25, 2026	Feb 24, 2026
Mfsa2026 15	—	Upgrade to Mozilla Firefox ESR version 140.8Upgrade to the latest version of Mozilla Firefox	Feb 25, 2026	Feb 24, 2026
Mozilla Thunderbird	—	Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.8	Feb 25, 2026	Feb 24, 2026
Oracle_linux	—	Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11	Feb 27, 2026	Feb 24, 2026
Redhat_linux	—	Upgrade firefox-debuginfoNo solution existsUpgrade firefox-x11Upgrade thunderbird-debugsourceUpgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefox-debugsource	Feb 26, 2026	Feb 24, 2026
Rocky_linux	—	Upgrade firefox-x11Upgrade thunderbirdUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbird-debugsource	Mar 2, 2026	Feb 26, 2026
Suse	—	Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-develUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbirdUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-openpgp-librnpUpgrade MozillaFirefox	Mar 10, 2026	Feb 26, 2026

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CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence