---
title: "CVE-2026-92061: Firefox - Sandbox Bypass"
description: "Firefox contains a security vulnerability caused by incorrect boundary conditions in the Process Sandboxing component, letting attackers potentially bypass sandbox restrictions, exploit requires unspecified conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-92061/
---

# CVE-2026-92061 Firefox - Sandbox Bypass

Firefox contains a security vulnerability caused by incorrect boundary conditions in the Process Sandboxing component, letting attackers potentially bypass 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-2026-92061)

## Details

Type

Sandbox Bypass

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-119](https://cwe.mitre.org/data/definitions/119.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-2026-92061](https://nvd.nist.gov/vuln/detail/CVE-2026-92061)
- [https://bugzilla.mozilla.org/show\_bug.cgi?id=2041758](https://bugzilla.mozilla.org/show_bug.cgi?id=2041758)
- [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/)

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## 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.

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