CVE-2021-4140
Critical
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.
SeverityCritical
CVSS10.0
Exploit probability—
Product
Mozilla Firefox
PublishedDec 22, 2022
First seenDec 22, 2022
Weakness typeCWE-91CWE-91
How to fix
Update
- mozilla firefox96.0 or later
- mozilla firefox_esr91.5 or later
- mozilla thunderbird91.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 96.0 | 96.0 |
| mozilla firefox_esr | v < 91.5 | 91.5 |
| mozilla thunderbird | v < 91.5 | 91.5 |
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