CVE-2026-92054 is a privilege escalation vulnerability affecting the Memory component in Firefox. The vulnerability was resolved in Firefox 156 and Firefox ESR 153.3. It has a CVSS 3.1 base score of 8.8, indicating high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts confidentiality, integrity, and availability. The Mozilla advisory confirms the fix and provides no indication of active exploitation in the wild.

Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox process, potentially leading to unauthorized access or control over the affected system. The CVSS score of 8.8 reflects a high impact on confidentiality, integrity, and availability.

Users and administrators should update Firefox to version 156 or later, or Firefox ESR to version 153.3 or later, to remediate this vulnerability. The vendor advisory confirms that this issue is fixed in these versions. No additional mitigation steps are required beyond applying the official update.