CVE-2026-12316

Vulnerability

CVE-2026-12316 is a mitigation bypass vulnerability in the DOM Security component of Firefox. The vulnerability allows an attacker to bypass a security mitigation, potentially undermining the browser's security model. The issue was present in Firefox versions prior to 152 and was fixed in Firefox 152 [1].

Exploitation

The exact exploitation requirements are not detailed in the available references. However, as a mitigation bypass in the DOM Security component, exploitation likely requires the attacker to have some level of control over web content, such as through a malicious website or injected script. User interaction may be required to trigger the vulnerable code path.

Impact

Successful exploitation could allow an attacker to bypass security mitigations implemented in the DOM Security component. This could lead to further compromise, such as privilege escalation or sandbox escape, depending on the specific mitigation bypassed. The impact is rated as high by Mozilla [1].

Mitigation

The vulnerability is fixed in Firefox 152, released on June 16, 2026 [1]. Users should update to Firefox 152 or later. No workarounds are available. The CVE is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog as of the publication date.