PT-2026-84181 · Mozilla · Firefox+1

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CVE-2026-84128

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Published

2026-09-01

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Updated

2026-09-04

CVSS v3.1

8.8

High

VectorAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 155 Thunderbird versions prior to 155
Description Privilege escalation exists in the WebDriver BiDi component. WebDriver BiDi is a protocol that allows for bidirectional communication between the browser and the automation tool.
Recommendations Update Firefox to version 155. Update Thunderbird to version 155.

Fix

LPE

Improper Access Control

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Weakness Enumeration

Related Identifiers

CVE-2026-84128
OPENSUSE-SU-2026:11677-1

Affected Products

Firefox
Thunderbird