{"id":"CVE-2026-12296","title":"Sandbox escape in the Security: Process Sandboxing component","summary":"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.","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-693","CWE-403"],"vendor":"mozilla","product":"firefox","affected":["firefox < 140.12.0","firefox < 152.0.0","thunderbird < 140.12.0","thunderbird < 152.0.0"],"patched":["firefox 152.0.0","thunderbird 152.0.0"],"published":"2026-06-16","updated":"2026-07-07","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-12296","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2040515","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-57/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-60/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-61/","label":"security@mozilla.org"},{"url":"https://access.redhat.com/errata/RHSA-2026:27717","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27733","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27734","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29940","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:30846","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:33445","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36100","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36101","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36102","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:36103","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-12296","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2489232","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12296.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00393,"epssPercentile":0.33217,"ingestedAt":"2026-07-07T13:53:11.832Z","slug":"CVE-2026-12296","body":"## Overview\n\nSandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.\n\n## Affected\n\n- `firefox < 140.12.0`\n- `firefox < 152.0.0`\n- `thunderbird < 140.12.0`\n- `thunderbird < 152.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 152.0.0`\n- `thunderbird 152.0.0`","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}