Is CVE-2026-100800 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100800?

CVE-2026-100800 has a CVSS v3 severity of CRITICAL (9.6).

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Description

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.