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9.8
Firefox and Thunderbird Spoofing Flaw on Android
CVE-2026-2800
Summary
A security issue in Firefox and Thunderbird on Android allows attackers to pretend to be legitimate websites. This could lead to users entering sensitive information into fake websites. Update to the latest version to fix this issue.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| mozilla | firefox | <= 148.0 | – |
| mozilla | thunderbird | <= 148.0 | – |
Original title
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
Spoofing issue in the WebAuthn component in Firefox for Android. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
9.8
Vulnerability type
CWE-290
- https://bugzilla.mozilla.org/show_bug.cgi?id=1988145 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-13/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/ Vendor Advisory
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026