CVE-2026-100807

Published: Sep 29, 2026Modified: Oct 19, 2026

8.8

Vector

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

Exploitability: 2.8 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

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

Affected (6)

Products: Mozilla: Firefox, Thunderbird

Mozilla

2 products

Firefox

Thunderbird

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	version < 140.17.0
Mozilla Firefox	141.0 ≤ version < 153.4.0
Mozilla Firefox	154.0.0 ≤ version < 157.0.0
Mozilla Thunderbird	version < 140.17.0
Mozilla Thunderbird	141.0 ≤ version < 153.4.0
Mozilla Thunderbird	154.0 ≤ version < 157.0