mozilla firefox CVE-2026-92048 vulnerability in Mozilla Products
Published on September 15, 2026

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

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Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

NVD

Vulnerability Analysis

CVE-2026-92048 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2026-92048 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2026-92048

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Affected Versions

Mozilla Firefox: Mozilla Thunderbird: