cbcvebase.
CVE-2026-117959
published 2026-10-27

CVE-2026-117959: Site isolation issue in the DOM: Service Workers component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird…

PriorityP427
EPSS
0.18%
7.7th percentile
Site isolation issue in the DOM: Service Workers component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Affected

4 ranges
VendorProductVersion rangeFixed in
mozillafirefox< Firefox 159Firefox 159
mozillafirefox_esr< Firefox ESR 153.6Firefox ESR 153.6
mozillathunderbird< Thunderbird 153.6Thunderbird 153.6
mozillathunderbird< Thunderbird 159Thunderbird 159
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.