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4.2
Firefox and Thunderbird: Malicious Code Can Be Injected
CVE-2026-2802
Summary
A flaw in Firefox and Thunderbird versions before 148 allows attackers to inject malicious code. This could lead to unauthorized actions being taken on your computer. 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
Race condition in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
Race condition in the JavaScript: GC component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
4.2
Vulnerability type
CWE-362
Race Condition
- https://bugzilla.mozilla.org/show_bug.cgi?id=2011069 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