CVE-2026-12296
Sandbox escape in the Security: Process Sandboxing component
- State
- Published
- Severity
- 9.6 Critical
- Published
- Jun 16, 2026
- Updated
- Jul 15, 2026
- Reserved
- Jun 15, 2026
Description
Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H | CISA-ADP |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H | redhat-SADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2040515
- https://www.mozilla.org/security/advisories/mfsa2026-57/
- https://www.mozilla.org/security/advisories/mfsa2026-58/
- https://www.mozilla.org/security/advisories/mfsa2026-60/
- https://www.mozilla.org/security/advisories/mfsa2026-61/
- https://access.redhat.com/security/cve/CVE-2026-12296vdb-entry
- RHBZ#2489232issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12296.json
- https://access.redhat.com/errata/RHSA-2026:38506vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36100vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:38751vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:27733vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:30846vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:27717vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:33445vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36102vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:39428vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37210vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:39141vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36103vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:39142vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:36101vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:39706vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:39011vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:38753vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37391vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:38750vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:27734vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:29940vendor-advisory
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