CVE-2026-8970
published 2026-05-19CVE-2026-8970: Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.31%
22.7th percentile
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 140.11.0 | 140.11.0 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.11 | Firefox ESR 140.11 |
| mozilla | thunderbird | < Thunderbird 140.11 | Thunderbird 140.11 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < 140.11 | 140.11 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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Red Hat
firefox: Privilege escalation in the Security component
vendor_redhat·2026-05-19·CVSS 8.8
CVE-2026-8970 [HIGH] CWE-266 firefox: Privilege escalation in the Security component
firefox: Privilege escalation in the Security component
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Security component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affected
Package: firefox (Red Hat Enterprise Linux 8) - Affected
Package: firefox (Red Hat Enterprise Linux 9) - Affected
Mozilla
Mozilla Foundation Security Advisory 2026-51: CVE-2026-8970
vendor_mozilla·CVSS 7.3
CVE-2026-8970 [HIGH] Mozilla Foundation Security Advisory 2026-51: CVE-2026-8970
Mozilla Foundation Security Advisory 2026-51
CVE: CVE-2026-8970
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.11
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8970
vendor_mozilla·CVSS 7.3
CVE-2026-8970 [HIGH] Mozilla Foundation Security Advisory 2026-46: CVE-2026-8970
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8970
Product: Firefox
Impact: high
Fixed in: Firefox 151
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8970
vendor_mozilla·CVSS 7.3
CVE-2026-8970 [HIGH] Mozilla Foundation Security Advisory 2026-50: CVE-2026-8970
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8970
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
Mozilla
Mozilla Foundation Security Advisory 2026-48: CVE-2026-8970
vendor_mozilla·CVSS 7.3
CVE-2026-8970 [HIGH] Mozilla Foundation Security Advisory 2026-48: CVE-2026-8970
Mozilla Foundation Security Advisory 2026-48
CVE: CVE-2026-8970
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.11
GHSA
GHSA-qqf4-pjxf-9rj2: Privilege escalation in the Security component
ghsa_unreviewed·2026-05-19
CVE-2026-8970 [HIGH] CWE-269 GHSA-qqf4-pjxf-9rj2: Privilege escalation in the Security component
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
VulDB
Mozilla Firefox up to 140.10/150 Security privilege escalation (EUVD-2026-30920)
vuldb·2026-05-19·CVSS 7.3
CVE-2026-8970 [HIGH] Mozilla Firefox up to 140.10/150 Security privilege escalation (EUVD-2026-30920)
A vulnerability categorized as problematic has been discovered in Mozilla Firefox up to 140.10/150. This affects an unknown function of the component Security Component. The manipulation results in privilege escalation.
This vulnerability is known as CVE-2026-8970. Access to the local network is required for this attack. No exploit is available.
It is advisable to upgrade the affected component.
No detection rules found.
No public exploits indexed.
2026-05-19
Published