PT-2026-21733 · Mozilla · Firefox+1

Hafiizh + 1 · Published 2026-02-24 · Updated 2026-03-01 · CVE-2026-2800

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 148 Thunderbird versions prior to 148

Description A spoofing issue exists in the WebAuthn component in Firefox for Android. This issue affects Firefox and Thunderbird.

Recommendations Update Firefox to version 148 or later. Update Thunderbird to version 148 or later.

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-2800

OPENSUSE-SU-2026:10257-1

Affected Products

Firefox

Thunderbird

References · 64

• https://osv.dev/vulnerability/CVE-2026-2800 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-2800 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-2800 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-13 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10257-1 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-13/#CVE-2026-2800 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-16 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2800 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-2800 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-2786 · Note
• https://suse.com/security/cve/CVE-2026-2759 · Note
• https://suse.com/security/cve/CVE-2026-2790 · Note
• https://suse.com/security/cve/CVE-2026-2760 · Note
• https://suse.com/security/cve/CVE-2026-2795 · Note
• https://suse.com/security/cve/CVE-2026-2766 · Note