Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Mfsa2026 106 | — | Upgrade to Mozilla Firefox version 158.0Upgrade to the latest version of Mozilla Firefox | Oct 13, 2026 | Oct 13, 2026 |
| Mfsa2026 108 | — | Upgrade to Mozilla Firefox ESR version 153.5Upgrade to the latest version of Mozilla Firefox | Oct 13, 2026 | Oct 13, 2026 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 153.5Upgrade to the latest version of Mozilla Thunderbird | Oct 13, 2026 | Oct 13, 2026 |
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