Is CVE-2026-100831 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100831?

CVE-2026-100831 has a CVSS v3 severity of HIGH (8.8).

Back

Description

Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.