| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 94.0 | 94.0 |
| firefox esr | < 91.3 | 91.3 |
| thunderbird | < 91.3 | 91.3 |
The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
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