CVE-2026-84123
published 2026-09-01CVE-2026-84123: Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.44%
36.5th percentile
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 155 | Firefox 155 |
| mozilla | firefox | < 153.2.0 | 153.2.0 |
| mozilla | firefox | >= 154.0.0 < 155.0.0 | 155.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.2 | Firefox ESR 153.2 |
| mozilla | thunderbird | < Thunderbird 153.2 | Thunderbird 153.2 |
| mozilla | thunderbird | < Thunderbird 155 | Thunderbird 155 |
| mozilla | thunderbird | < 153.2.0 | 153.2.0 |
| mozilla | thunderbird | >= 154.0 < 155.0 | 155.0 |
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 due to use-after-free in the Graphics: WebGPU component
vendor_redhat·2026-09-01·CVSS 8.8
CVE-2026-84123 [HIGH] CWE-825 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: WebGPU component
firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: WebGPU component
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation due to use-after-free in the Graphics: WebGPU 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 Enterp
Mozilla
Mozilla Foundation Security Advisory 2026-82: CVE-2026-84123
vendor_mozilla·CVSS 8.8
CVE-2026-84123 [HIGH] Mozilla Foundation Security Advisory 2026-82: CVE-2026-84123
Mozilla Foundation Security Advisory 2026-82
CVE: CVE-2026-84123
Product: Firefox
Impact: high
Fixed in: Firefox 155
Mozilla
Mozilla Foundation Security Advisory 2026-85: CVE-2026-84123
vendor_mozilla·CVSS 8.8
CVE-2026-84123 [HIGH] Mozilla Foundation Security Advisory 2026-85: CVE-2026-84123
Mozilla Foundation Security Advisory 2026-85
CVE: CVE-2026-84123
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.2
Mozilla
Mozilla Foundation Security Advisory 2026-88: CVE-2026-84123
vendor_mozilla·CVSS 8.8
CVE-2026-84123 [HIGH] Mozilla Foundation Security Advisory 2026-88: CVE-2026-84123
Mozilla Foundation Security Advisory 2026-88
CVE: CVE-2026-84123
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.2
Mozilla
Mozilla Foundation Security Advisory 2026-86: CVE-2026-84123
vendor_mozilla·CVSS 8.8
CVE-2026-84123 [HIGH] Mozilla Foundation Security Advisory 2026-86: CVE-2026-84123
Mozilla Foundation Security Advisory 2026-86
CVE: CVE-2026-84123
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 155
GHSA
Privilege escalation due to use-after-free in the Graphics: WebGPU component.
ghsa_unreviewed·2026-09-01
CVE-2026-84123 [HIGH] CWE-416 Privilege escalation due to use-after-free in the Graphics: WebGPU component.
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-84123 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: WebGPU component
bugzilla·2026-09-01·CVSS 8.8
CVE-2026-84123 [HIGH] CVE-2026-84123 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: WebGPU component
CVE-2026-84123 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: WebGPU component
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.
Hackernews
⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and More
blogs_hackernews·2026-09-07·CVSS 6.9
CVE-2026-86206 [MEDIUM] ⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and More
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## ⚡ Weekly Recap: Chrome 0-Day, Router Hijacks, Coder Supply Chain Attack and More
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2026-09-01
Published