CVE-2026-100809

HighCVSS 8.1/10Last modified Oct 5, 2026

Description

Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-346

Affected software

No affected versions have been published.

Timeline

Published
Sep 29, 2026
Last modified
Oct 5, 2026
NVD status
Analyzed

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CVE-2026-100809: High severity, CVSS 8.1 | Vulnix