vulnerability
MFSA2022-02 Firefox: Security Vulnerabilities fixed in Firefox ESR 91.5 (CVE-2021-4140)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 10 | (AV:N/AC:L/Au:N/C:C/I:C/A:C) | Jan 11, 2022 | Jan 12, 2022 | Feb 10, 2026 |
Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
Jan 11, 2022
Added
Jan 12, 2022
Modified
Feb 10, 2026
Description
It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Solution
mozilla-firefox-esr-upgrade-91_5
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