CVE-2026-6761
published 2026-04-21CVE-2026-6761: Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
PriorityP345high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.22%
12.6th percentile
Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150 | Firefox 150 |
| mozilla | firefox | < 140.10.0 | 140.10.0 |
| mozilla | firefox | < 150.0 | 150.0 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.10 | Firefox ESR 140.10 |
| mozilla | thunderbird | < Thunderbird 140.10 | Thunderbird 140.10 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | < 140.10.0 | 140.10.0 |
| 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 Networking component
vendor_redhat·2026-04-21·CVSS 8.8
CVE-2026-6761 [HIGH] CWE-266 firefox: Privilege escalation in the Networking component
firefox: Privilege escalation in the Networking component
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Networking 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 2026-34: CVE-2026-6761
vendor_mozilla·CVSS 8.8
CVE-2026-6761 [HIGH] Mozilla Foundation Security Advisory 2026-34: CVE-2026-6761
Mozilla Foundation Security Advisory 2026-34
CVE: CVE-2026-6761
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-32: CVE-2026-6761
vendor_mozilla·CVSS 8.8
CVE-2026-6761 [HIGH] Mozilla Foundation Security Advisory 2026-32: CVE-2026-6761
Mozilla Foundation Security Advisory 2026-32
CVE: CVE-2026-6761
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6761
vendor_mozilla·CVSS 8.8
CVE-2026-6761 [HIGH] Mozilla Foundation Security Advisory 2026-30: CVE-2026-6761
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6761
Product: Firefox
Impact: high
Fixed in: Firefox 150
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6761
vendor_mozilla·CVSS 8.8
CVE-2026-6761 [HIGH] Mozilla Foundation Security Advisory 2026-33: CVE-2026-6761
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6761
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
GHSA
GHSA-5mff-cxq5-82jv: Privilege escalation in the Networking component
ghsa_unreviewed·2026-04-21
CVE-2026-6761 [MEDIUM] CWE-269 GHSA-5mff-cxq5-82jv: Privilege escalation in the Networking component
Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
No detection rules found.
No public exploits indexed.
2026-04-21
Published