What is CVE-2026-100807?

CVE-2026-100807 is a high-severity vulnerability, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-09-29.

How severe is CVE-2026-100807?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-100807

Privilege escalation in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.

Vulnerability class: Privilege Escalation

Published 2026-09-29 · last modified 2026-09-30.

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

What is CVE-2026-100807?: CVE-2026-100807 is a high-severity vulnerability, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-09-29.
How severe is CVE-2026-100807?: High severity. CVSS v3 base score is 8.8 out of 10.