CVE-2026-2800

Spoofing issue in the WebAuthn component in Firefox for Android

State: Published
Severity: 9.8 Critical
Published: Feb 24, 2026
Updated: Apr 13, 2026
Reserved: Feb 19, 2026

Description

Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
FirefoxMozilla	148 and laterNot affected
ThunderbirdMozilla	148 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1988145
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-16/

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