mozilla firefox CVE-2026-92059 vulnerability in Mozilla Products
Published on September 15, 2026

Incorrect boundary conditions in the DOM: Editor component

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Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

NVD

Vulnerability Analysis

CVE-2026-92059 can be exploited with local system access, and does not require authorization privileges or user interaction. 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:
LOCAL
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
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-2026-92059 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2026-92059

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Affected Versions

Mozilla Firefox: Mozilla Thunderbird: