vulnerability
MFSA2026-21 Firefox: Security Vulnerabilities fixed in Firefox ESR 115.34 (CVE-2026-4692)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 10 | (AV:N/AC:L/Au:N/C:C/I:C/A:C) | Mar 24, 2026 | Mar 27, 2026 | Mar 27, 2026 |
Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
Mar 24, 2026
Added
Mar 27, 2026
Modified
Mar 27, 2026
Description
Sandbox escape in the Responsive Design Mode component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
Solution
mozilla-firefox-esr-upgrade-115_34
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