Privilege Escalation Vulnerability in Firefox by Mozilla
CVE-2026-84128

Currently unrated

Key Information:

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

What is CVE-2026-84128?

A privilege escalation vulnerability exists in the WebDriver BiDi component of Firefox, allowing attackers to potentially gain elevated privileges within the application. This flaw was addressed in Firefox 155, highlighting the importance of regular updates to maintain system security.

Affected Version(s)

Firefox 155

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2044280

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

Download the Critical Vulnerability Management Cheat Sheet

Timeline

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

Credit

Tomoya Nakanishi

CVE-2026-84128 Data

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