Vulnerability · CVE-2026-2800
Spoofing issue in the WebAuthn component in Firefox for Android.
Published Feb 24, 2026 · catalog updated Jun 17, 2026 · Spoofing issue in the
Check if you run it
No confirmed exploitation is on record for CVE-2026-2800. EPSS is 0.59%. Act only if a listed version of Spoofing issue in the is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (Spoofing issue in the).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Critical9.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.59%
- Remediation
- Advisory link
- Affected products
- cpe mozilla/firefox · cpe mozilla/thunderbird
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe mozilla/firefoxversion unspecified
- cpe mozilla/thunderbirdversion unspecified
How to fix CVE-2026-2800
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-2800. EPSS is 0.59%. Act only if a listed version of Spoofing issue in the is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-290: Authentication Bypass by Spoofing. EPSS 0.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Feb 24, 2026 · NIST NVD
Detected
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Jun 17, 2026 · NIST NVD
Updated
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
Sources
- CVE.orgVulnerability recordCVE-2026-2800
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-2800
30-day exploitation probability 0.6%
first.org - NIST NVDVulnerability recordCVE-2026-2800
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.