vulnerability
MFSA2026-13 Firefox: Security Vulnerabilities fixed in Firefox 148 (CVE-2026-2778)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 10 | (AV:N/AC:L/Au:N/C:C/I:C/A:C) | Feb 24, 2026 | Feb 25, 2026 | Apr 15, 2026 |
Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
Feb 24, 2026
Added
Feb 25, 2026
Modified
Apr 15, 2026
Description
Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Solution
mozilla-firefox-upgrade-148_0
Rapid7 Labs
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