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CVE-2026-100786: firefox before 115.42.0 (exclusive), from 116.0 (inclusive), before 140.17.0 (exclusive), from 141.0 (inclusive), before 153.4.0 (exclusive) (+1 more affected versions); +1 more affected products
CVE-2026-100786. CVSS 3.1 base score 9.6 (CRITICAL, Source advisory). EPSS 0.0034 (percentile 0.25196), scored 2026-10-04.
Affected technology
firefox · before 115.42.0 (exclusive)
mozilla
firefox · from 116.0 (inclusive), before 140.17.0 (exclusive)
mozilla
firefox · from 141.0 (inclusive), before 153.4.0 (exclusive)
mozilla
firefox · from 154.0.0 (inclusive), before 157.0.0 (exclusive)
mozilla
thunderbird · before 140.17.0 (exclusive)
mozilla
thunderbird · from 141.0 (inclusive), before 153.4.0 (exclusive)
mozilla
thunderbird · from 154.0 (inclusive), before 157.0 (exclusive)
mozilla
Component: Not specified by the source
Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · User interaction required
What an attacker can do
Source advisory’s CVSS 3.1 assessment (base score 9.6/10) rates confidentiality, integrity and availability impact as high. The description does not specify what an attacker can achieve beyond these rated impacts.
- CWE
- CWE-416
- CCR priority
- 38.5 /100 (P4)
- CVSS 3.1
- 9.6 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H · Source advisory
- EPSS
- 0.0034 · percentile 0.25196 · 2026-10-04
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-05 23:09:08.830529+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-100786.html