CVE-2026-92055
published 2026-09-15CVE-2026-92055: Privilege escalation in the DevTools component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.23%
12.4th percentile
Privilege escalation in the DevTools component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 153.3.0 | 153.3.0 |
| mozilla | firefox | >= 154.0.0 < 156.0.0 | 156.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.3 | Firefox ESR 153.3 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
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 DevTools component
vendor_redhat·2026-09-15·CVSS 8.8
CVE-2026-92055 [HIGH] CWE-368 firefox: thunderbird: Privilege escalation in the DevTools component
firefox: thunderbird: Privilege escalation in the DevTools component
Privilege escalation in the DevTools component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the DevTools 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 af
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92055
vendor_mozilla·CVSS 8.8
CVE-2026-92055 [HIGH] Mozilla Foundation Security Advisory 2026-96: CVE-2026-92055
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92055
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92055
vendor_mozilla·CVSS 8.8
CVE-2026-92055 [HIGH] Mozilla Foundation Security Advisory 2026-93: CVE-2026-92055
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92055
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92055
vendor_mozilla·CVSS 8.8
CVE-2026-92055 [HIGH] Mozilla Foundation Security Advisory 2026-94: CVE-2026-92055
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92055
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92055
vendor_mozilla·CVSS 8.8
CVE-2026-92055 [HIGH] Mozilla Foundation Security Advisory 2026-90: CVE-2026-92055
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92055
Product: Firefox
Impact: low
Fixed in: Firefox 156
GHSA
Privilege escalation in the DevTools component.
ghsa_unreviewed·2026-09-15
CVE-2026-92055 [HIGH] CWE-269 Privilege escalation in the DevTools component.
Privilege escalation in the DevTools component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.
No detection rules found.
No public exploits indexed.
2026-09-15
Published