Is CVE-2026-100820 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100820?

CVE-2026-100820 has a CVSS v3 severity of HIGH (8.8).

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Description

Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.