CVE-2026-8970 is a privilege escalation vulnerability found in the Security component of Mozilla Firefox. The flaw could potentially allow an attacker to gain elevated privileges within the browser context. Mozilla fixed this vulnerability in Firefox 151 and Firefox ESR 140.11 as part of their May 19, 2026 security advisories (MFSA2026-46 and MFSA2026-48). While the impact for this specific CVE is rated low, it is included in a security update that also addresses multiple other vulnerabilities with higher impact ratings. No CVSS score is provided for this vulnerability.

The vulnerability allows privilege escalation within Firefox's Security component, which could enable an attacker to perform actions with elevated privileges in the browser environment. However, Mozilla rates the impact of this specific vulnerability as low. There are no known exploits in the wild targeting this vulnerability. The overall security update addresses a range of vulnerabilities with impacts from low to high.

Mozilla has released official fixes for this vulnerability in Firefox 151 and Firefox ESR 140.11. Users and administrators should update to these versions or later to remediate this issue. Since the vulnerability is fixed in these versions, no additional mitigation steps are required beyond applying the update.