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VULNERABILITIES

CVE-2026-84134 Details

Description

Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2044882 [email protected]Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-82/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-85/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-86/ [email protected]Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-88/ [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-200Exposure of Sensitive Information to an Unauthorized ActorCISA-ADP

Affected Products

ProductVersions
mozilla firefox
< 153.2.0
>= 154.0.0, < 155.0.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
mozilla thunderbird
< 153.2.0
>= 154.0, < 155.0

CPE

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-84134
NVD Published Date:
Sep 1, 2026
NVD Last Modified:
Sep 3, 2026
Source:
[email protected]
CVE-2026-84134 Details - Not Deferred