Privilege Escalation Vulnerability in Mozilla Firefox
CVE-2026-92043

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
15 September 2026

What is CVE-2026-92043?

A privilege escalation vulnerability exists in the audio/video component of Mozilla Firefox due to improper boundary conditions. Attackers could leverage this flaw to escalate their privileges on an affected system. This issue has been addressed in Firefox version 156 and Firefox ESR version 153.3. It is crucial users apply these updates to safeguard their systems against potential exploitation.

Affected Version(s)

Firefox 153.3

Firefox 156

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2050150
https://www.mozilla.org/security/advisories/mfsa2026-90/
https://www.mozilla.org/security/advisories/mfsa2026-93/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mozilla
.