CVE-2026-74965
published 2026-08-18CVE-2026-74965: Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154…
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.30%
21.8th percentile
Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 140.14.0 | 140.14.0 |
| mozilla | firefox | < 154.0.0 | 154.0.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.14 | Firefox ESR 140.14 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < Thunderbird 140.14 | Thunderbird 140.14 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < 140.14.0 | 140.14.0 |
| mozilla | thunderbird | < 154.0 | 154.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 153.0 < 153.1.0 | 153.1.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-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 Shell Integration component
vendor_redhat·2026-08-18·CVSS 8.8
CVE-2026-74965 [HIGH] CWE-266 firefox: Privilege escalation in the Shell Integration component
firefox: Privilege escalation in the Shell Integration component
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Shell Integration 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: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: thunderbird (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat En
Mozilla
Mozilla Foundation Security Advisory 2026-76: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-76: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-76
CVE: CVE-2026-74965
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.14
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74965
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74965
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-79: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-79: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-79
CVE: CVE-2026-74965
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.14
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74965
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74965
vendor_mozilla
CVE-2026-74965 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74965
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74965
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
GHSA
Privilege escalation in the Shell Integration component.
ghsa_unreviewed·2026-08-18
CVE-2026-74965 [HIGH] CWE-269 Privilege escalation in the Shell Integration component.
Privilege escalation in the Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2053455https://www.mozilla.org/security/advisories/mfsa2026-74/https://www.mozilla.org/security/advisories/mfsa2026-76/https://www.mozilla.org/security/advisories/mfsa2026-77/https://www.mozilla.org/security/advisories/mfsa2026-78/https://www.mozilla.org/security/advisories/mfsa2026-79/https://www.mozilla.org/security/advisories/mfsa2026-80/
2026-08-18
Published