CVE-2026-12295

Modified Modified - Updated After Analysis

DOM Navigation Sandbox Escape in Firefox

Publication date: 2026-06-16

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-06-16

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-06-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-12295

EUVD

EUVD-2026-37086

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 152.0.0 (exc)
mozilla	firefox	to 115.37.0 (exc)
mozilla	thunderbird	to 152.0.0 (exc)
mozilla	thunderbird	to 140.12.0 (exc)
mozilla	firefox	From 128.0 (inc) to 140.12.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
CWE-653	The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions.

Attack-Flow Graph

Executive Summary

This vulnerability is a sandbox escape in the DOM Navigation component of Mozilla Firefox. It allows an attacker to break out of the browser's security sandbox, potentially enabling unauthorized actions or access beyond the intended restrictions.

The issue was addressed and fixed in Firefox versions 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Impact Analysis

Exploitation of this sandbox escape vulnerability could allow attackers to execute code or perform actions outside the browser's restricted environment, potentially leading to unauthorized access to system resources or sensitive information.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 152 or later, or update Firefox ESR to version 140.12 or later, or ESR 115.37 or later.

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