PT-2026-84187 · Mozilla · Firefox+2

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CVE-2026-84134

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Published

2026-09-01

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Updated

2026-09-05

CVSS v3.1

9.8

Critical

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 155 Firefox ESR versions prior to 153.2 Thunderbird versions prior to 155 Thunderbird versions prior to 153.2
Description An issue exists within the Profile Backup component.
Recommendations Update Firefox to version 155. Update Firefox ESR to version 153.2. Update Thunderbird to version 155. Update Thunderbird to version 153.2.

Fix

Information Disclosure

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Weakness Enumeration

Related Identifiers

CVE-2026-84134
OPENSUSE-SU-2026:11666-1
OPENSUSE-SU-2026:11677-1

Affected Products

Firefox
Firefox Esr
Thunderbird