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CVE-2026-8958: firefox before 140.11.0 (exclusive), before 151.0.0 (exclusive); +1 more affected products
CVE-2026-8958. CVSS 3.1 base score 8.6 (HIGH, Source advisory). EPSS 0.00439 (percentile 0.36372), scored 13-Oct-2026.
Affected technology
firefox · before 140.11.0 (exclusive)
mozilla
firefox · before 151.0.0 (exclusive)
mozilla
thunderbird · before 140.11 (exclusive)
mozilla
thunderbird · before 151.0.0 (exclusive)
mozilla
Component: Not specified by the source
Attack conditions (Source advisory, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
Source advisory’s CVSS 3.1 assessment (base score 8.6/10) rates confidentiality impact as high; integrity and availability impact as none. The description does not specify what an attacker can achieve beyond these rated impacts.
- CWE
- CWE-668, CWE-693
- CCR priority
- 34.5 /100 (P4)
- CVSS 3.1
- 8.6 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N · Source advisory
- EPSS
- 0.00439 · percentile 0.36372 · 2026-10-13
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-15 01:07:31.726917+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-8958.html