--- title: "CVE-2026-92066: Firefox - Sandbox Escape" description: "Firefox contains a sandbox escape caused by a vulnerability in the Profile Backup component, letting attackers escape sandbox restrictions, exploit requires unspecified conditions." url: https://panop.io/threat-heartbeat/CVE-2026-92066/ --- # CVE-2026-92066 Firefox - Sandbox Escape Firefox contains a sandbox escape caused by a vulnerability in the Profile Backup component, letting attackers escape sandbox restrictions, exploit requires unspecified conditions. CVSS base score 9.8 /10 Critical CISA KEV Not listed Public exploit None known EPSS 0.55% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-92066) ## Details Type Sandbox Escape Impact Privilege Escalation CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Published 15 September 2026 Updated 15 October 2026 Weakness [CWE-693](https://cwe.mitre.org/data/definitions/693.html) ## Vendor fix Update to Firefox 156 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-92066](https://nvd.nist.gov/vuln/detail/CVE-2026-92066) - [https://bugzilla.mozilla.org/show\_bug.cgi?id=2058093](https://bugzilla.mozilla.org/show_bug.cgi?id=2058093) - [https://www.mozilla.org/security/advisories/mfsa2026-90/](https://www.mozilla.org/security/advisories/mfsa2026-90/) - [https://www.mozilla.org/security/advisories/mfsa2026-94/](https://www.mozilla.org/security/advisories/mfsa2026-94/) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)