Profile Backup Component Vulnerability in Firefox
CVE-2026-84134

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 1 September 2026

What is CVE-2026-84134?

A vulnerability exists in the Profile Backup component of Firefox, which could be exploited under certain conditions. Mozilla addressed this issue in Firefox version 155 and Firefox ESR version 153.2, ensuring improved security for users. It is critical for users to update their browsers to maintain protection against potential threats.

Affected Version(s)

Firefox 153.2

Firefox 155

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2044882

https://www.mozilla.org/security/advisories/mfsa2026-82/

https://www.mozilla.org/security/advisories/mfsa2026-85/

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
Sep 1, 2026
Vulnerability Reserved
Sep 1, 2026

Credit

5up3rh3i

CVE-2026-84134 Data

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