CVE-2026-2800: Spoofing issue in the WebAuthn component in Firefox for Android

Published Feb 24, 2026
·
Updated

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

Affected Software

4 affected componentsFixes available
Mozilla Firefox<148
148
Mozilla Thunderbird<148
148
Mozilla Firefox<148.0
Mozilla Thunderbird<148.0

Event History

Feb 24, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·01:33 PM
Data Sourced
via MITRE·01:33 PM
Description
Data Sourced
via NVD·02:16 PM
DescriptionSeverityWeaknessAffected Software
Jan 4, 58137
Event
via FIRST·09:03 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-2800?

CVE-2026-2800 has a critical severity rating of 9.8 on the CVSS scale.

2

How do I fix CVE-2026-2800?

To fix CVE-2026-2800, update your Firefox or Thunderbird to version 148 or later.

3

What type of vulnerability is CVE-2026-2800?

CVE-2026-2800 is a spoofing issue affecting the WebAuthn component in Firefox for Android.

4

Which software is affected by CVE-2026-2800?

CVE-2026-2800 affects Mozilla Firefox for Android and Mozilla Thunderbird.

5

When was CVE-2026-2800 published?

CVE-2026-2800 was published on February 24, 2026.

Company

Resources

Contact

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