CVE-2026-74950
published 2026-08-18CVE-2026-74950: Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.22%
12.5th percentile
Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 153.1.0 | 153.1.0 |
| mozilla | firefox | < 154.0.0 | 154.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < 153.1.0 | 153.1.0 |
| mozilla | thunderbird | < 154.0 | 154.0 |
| mozilla | thunderbird | — | — |
| 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: thunderbird: Privilege escalation in the Downloads API component
vendor_redhat·2026-08-18·CVSS 8.8
CVE-2026-74950 [HIGH] CWE-648 firefox: thunderbird: Privilege escalation in the Downloads API component
firefox: thunderbird: Privilege escalation in the Downloads API component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Downloads API 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) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not 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) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 6) - Not affected
Package: firefo
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74950
vendor_mozilla
CVE-2026-74950 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74950
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74950
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74950
vendor_mozilla
CVE-2026-74950 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74950
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74950
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74950
vendor_mozilla
CVE-2026-74950 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74950
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74950
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74950
vendor_mozilla
CVE-2026-74950 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74950
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74950
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
GHSA
Privilege escalation in the Downloads API component.
ghsa_unreviewed·2026-08-18
CVE-2026-74950 [HIGH] CWE-269 Privilege escalation in the Downloads API component.
Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
2026-08-18
Published