CVE-2026-74952
published 2026-08-18CVE-2026-74952: Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird…
PriorityP344high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.23%
13.4th percentile
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 154.0.0 | 154.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.2 | Firefox ESR 153.2 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < Thunderbird 153.2 | Thunderbird 153.2 |
| mozilla | thunderbird | < 154.0 | 154.0 |
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 Application Update component
vendor_redhat·2026-08-18·CVSS 8.8
CVE-2026-74952 [HIGH] CWE-250 firefox: thunderbird: Privilege escalation in the Application Update component
firefox: thunderbird: Privilege escalation in the Application Update component
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154 and Thunderbird 154.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Application Update 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) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not affected
P
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74952
vendor_mozilla
CVE-2026-74952 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74952
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74952
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74952
vendor_mozilla
CVE-2026-74952 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74952
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74952
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-85: CVE-2026-74952
vendor_mozilla·CVSS 8.8
CVE-2026-74952 [HIGH] Mozilla Foundation Security Advisory 2026-85: CVE-2026-74952
Mozilla Foundation Security Advisory 2026-85
CVE: CVE-2026-74952
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.2
Mozilla
Mozilla Foundation Security Advisory 2026-88: CVE-2026-74952
vendor_mozilla·CVSS 8.8
CVE-2026-74952 [HIGH] Mozilla Foundation Security Advisory 2026-88: CVE-2026-74952
Mozilla Foundation Security Advisory 2026-88
CVE: CVE-2026-74952
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.2
VulDB
Mozilla Firefox up to 153 Application Update privileges management (EUVD-2026-60680)
vuldb·2026-09-02·CVSS 8.8
CVE-2026-74952 [HIGH] Mozilla Firefox up to 153 Application Update privileges management (EUVD-2026-60680)
A vulnerability was found in Mozilla Firefox up to 153 and classified as critical. This impacts an unknown function of the component Application Update. Such manipulation leads to improper privilege management.
This vulnerability is listed as CVE-2026-74952. The attack may be performed from remote. There is no available exploit.
It is suggested to upgrade the affected component.
GHSA
Privilege escalation in the Application Update component.
ghsa_unreviewed·2026-08-18
CVE-2026-74952 [HIGH] CWE-269 Privilege escalation in the Application Update component.
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154.
No detection rules found.
No public exploits indexed.
2026-08-18
Published