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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4635-1 firefox-esr security update
Debian DLA Debian DLA DLA-4636-1 thunderbird security update
Debian DSA Debian DSA DSA-6350-1 firefox-esr security update
Debian DSA Debian DSA DSA-6351-1 thunderbird security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/errata/RHSA-2026:27717 cve-icon
https://access.redhat.com/errata/RHSA-2026:27733 cve-icon
https://access.redhat.com/errata/RHSA-2026:27734 cve-icon
https://access.redhat.com/errata/RHSA-2026:29940 cve-icon
https://access.redhat.com/errata/RHSA-2026:30846 cve-icon
https://access.redhat.com/errata/RHSA-2026:33445 cve-icon
https://access.redhat.com/errata/RHSA-2026:36100 cve-icon
https://access.redhat.com/errata/RHSA-2026:36101 cve-icon
https://access.redhat.com/errata/RHSA-2026:36102 cve-icon
https://access.redhat.com/errata/RHSA-2026:36103 cve-icon
https://access.redhat.com/errata/RHSA-2026:37210 cve-icon
https://access.redhat.com/errata/RHSA-2026:37391 cve-icon
https://access.redhat.com/errata/RHSA-2026:38506 cve-icon
https://access.redhat.com/errata/RHSA-2026:38750 cve-icon
https://access.redhat.com/errata/RHSA-2026:38751 cve-icon
https://access.redhat.com/errata/RHSA-2026:38753 cve-icon
https://access.redhat.com/errata/RHSA-2026:39011 cve-icon
https://access.redhat.com/errata/RHSA-2026:39141 cve-icon
https://access.redhat.com/errata/RHSA-2026:39142 cve-icon
https://access.redhat.com/errata/RHSA-2026:39428 cve-icon
https://access.redhat.com/errata/RHSA-2026:39706 cve-icon
https://access.redhat.com/security/cve/CVE-2026-12296 cve-icon
https://bugzilla.mozilla.org/show_bug.cgi?id=2040515 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2489232 cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-12296 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12296.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-12296 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-57/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-58/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-58/#CVE-2026-12296 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-60/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-61/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-61/#CVE-2026-12296 cve-icon
History

Thu, 18 Jun 2026 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-264
CWE-272

Thu, 18 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-403
CWE-693
References
Metrics threat_severity

None

cvssV3_1

{'score': 9.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

threat_severity

Important


Thu, 18 Jun 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-264
CWE-272

Tue, 16 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12. 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.
References

Tue, 16 Jun 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 16 Jun 2026 13:15:00 +0000

Type Values Removed Values Added
Description Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Title Sandbox escape in the Security: Process Sandboxing component
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-07-15T11:48:21.627Z

Reserved: 2026-06-15T15:08:08.752Z

Link: CVE-2026-12296

cve-icon Vulnrichment

Updated: 2026-07-15T11:48:21.627Z

cve-icon NVD

Status : Modified

Published: 2026-06-16T13:16:29.833

Modified: 2026-07-15T12:17:05.973

Link: CVE-2026-12296

cve-icon Redhat

Severity : Important

Publid Date: 2026-06-16T11:52:29Z

Links: CVE-2026-12296 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-06-18T22:45:16Z

Weaknesses