Question 1

What is CVE-2026-109759 — CVE-2026-109759?

Accepted Answer

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Question 2

What is the authoritative source for CVE-2026-109759?

Accepted Answer

CVE-2026-109759 (CVE-2026-109759) is catalogued in NVD + CISA KEV + FIRST EPSS and curated for EU compliance use cases by SQUR.

EPSS	0.16% probability of exploitation · percentile 4.6% · 2026-10-17T12:00:28Z
Last modified	2026-10-13

CVE-2026-109759CVE-2026-109759

Description

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