mozilla firefox CVE-2026-84128 is a vulnerability in Mozilla Firefox
Published on September 1, 2026

Privilege escalation in the WebDriver BiDi component
Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155.

NVD

Vulnerability Analysis

CVE-2026-84128 is exploitable with network access, requires 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 very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is an Authorization Vulnerability?

The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CVE-2026-84128 has been classified to as an Authorization vulnerability or weakness.


Products Associated with CVE-2026-84128

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Mozilla Firefox
 

Affected Versions

Mozilla Firefox: