CVE-2026-2800 — Authentication Bypass by Spoofing in Mozilla Firefox

CWE-290 — Authentication Bypass by Spoofing9 documents8 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 81.51%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedFeb 24

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶NVDmozilla/firefox< 148.0
▶NVDmozilla/thunderbird< 148.0

🔴Vulnerability Details

3
OSV
CVE-2026-2800: Spoofing issue in the WebAuthn component in Firefox for Android↗2026-02-24
▶
CVEList
Spoofing issue in the WebAuthn component in Firefox for Android↗2026-02-24
▶
GHSA
GHSA-wcpx-2xqg-ff43: Spoofing issue in the WebAuthn component in Firefox for Android↗2026-02-24
▶

📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Spoofing issue in the WebAuthn component in Firefox for Android↗2026-02-24
▶
Debian
CVE-2026-2800: firefox - Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerabil...↗2026
▶
Mozilla
Mozilla Foundation Security Advisory 2026-16: CVE-2026-2800↗
▶
Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2800↗
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-2800 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-2800 — Authentication Bypass by Spoofing | cvebase