CVE-2026-12295
Critical
Description
Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
SeverityCritical
CVSS9.6
Exploit probability—
Product
Mozilla Firefox
PublishedJun 16, 2026
First seenJun 16, 2026
Weakness typeCWE-693CWE-693CWE-653CWE-653
How to fix
Update
- mozilla firefox115.37.0, 152.0.0, 140.12.0 or later
- mozilla thunderbird140.12.0, 152.0.0 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:38506
- access.redhat.com/errata/RHSA-2026:36100
- access.redhat.com/errata/RHSA-2026:38751
- access.redhat.com/errata/RHSA-2026:27733
- access.redhat.com/errata/RHSA-2026:30846
- access.redhat.com/errata/RHSA-2026:27717
- access.redhat.com/errata/RHSA-2026:33445
- access.redhat.com/errata/RHSA-2026:36102
- access.redhat.com/errata/RHSA-2026:39428
- access.redhat.com/errata/RHSA-2026:37210
- access.redhat.com/errata/RHSA-2026:39141
- access.redhat.com/errata/RHSA-2026:36103
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 115.37.0, v < 152.0.0, 128.0 ≤ v < 140.12.0 | 115.37.0, 152.0.0, 140.12.0 |
| mozilla thunderbird | v < 140.12.0, v < 152.0.0 | 140.12.0, 152.0.0 |
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