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CVE-2026-8959: firefox before 140.11.0 (exclusive), before 151.0.0 (exclusive); +1 more affected products
CVE-2026-8959. CVSS 3.1 base score 9.6 (CRITICAL, Source advisory). EPSS 0.00449 (percentile 0.3727), 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 · 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-20, CWE-119, CWE-693
- 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
- 0.00449 · percentile 0.3727 · 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-2026-8959.html