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CVE-2026-84134

CriticalCVSS 9.8/10Last modified Sep 3, 2026

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 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Mozilla	Firefox	—
Mozilla	Thunderbird	—

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2044882Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-82/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-85/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-86/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-88/Vendor Advisory

Timeline

Published: Sep 1, 2026
Last modified: Sep 3, 2026
NVD status: Analyzed

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