CVE-2026-92020
published 2026-09-15CVE-2026-92020: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR…
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.26%
16.4th percentile
Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 115.41.0 | 115.41.0 |
| mozilla | firefox | >= 116.0 < 140.16.0 | 140.16.0 |
| mozilla | firefox | >= 141.0 < 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 | firefox_esr | < Firefox ESR 140.16 | Firefox ESR 140.16 |
| mozilla | firefox_esr | < Firefox ESR 115.41 | Firefox ESR 115.41 |
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < 140.16.0 | 140.16.0 |
| mozilla | thunderbird | >= 141.0 < 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: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
vendor_redhat·2026-09-15·CVSS 8.8
CVE-2026-92020 [HIGH] CWE-787 firefox: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
firefox: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-95: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92020
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-94: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92020
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-90: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92020
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-93: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92020
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-96: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92020
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-92: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92020
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92020
vendor_mozilla·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Foundation Security Advisory 2026-91: CVE-2026-92020
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92020
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
GHSA
Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component.
ghsa_unreviewed·2026-09-15
CVE-2026-92020 [HIGH] CWE-120 Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component.
Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
VulDB
Mozilla Firefox up to 115.40/140.15/153.2/155 WebRender privileges management (EUVD-2026-78483)
vuldb·2026-09-15·CVSS 8.8
CVE-2026-92020 [HIGH] Mozilla Firefox up to 115.40/140.15/153.2/155 WebRender privileges management (EUVD-2026-78483)
A vulnerability was found in Mozilla Firefox up to 115.40/140.15/153.2/155. It has been classified as critical. This impacts an unknown function of the component WebRender. The manipulation leads to improper privilege management.
This vulnerability is documented as CVE-2026-92020. The attack can be initiated remotely. There is not any exploit available.
Upgrading the affected component is recommended.
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
blogs_hackernews·2026-09-21·CVSS 10.0
CVE-2026-76460 [CRITICAL] ⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
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## ⚡ Weekly Recap: Cisco 0-Day, AI Agent RCE, ClickFix Attacks, ClickFix Surge, and Browser Hijacks
A browser. A plugin. A package. A login screen. Normal stuff. That is basically the problem this week.
The trouble keeps showing up inside things people already trust: code that takes a bad turn, old payloads coming back, exposed systems, weak checks, fake fixes, and attack paths that look almost too easy. Even the research side is getting messy, with more findings, more automation, and not always more clarity.
Nothing here needs much drama. Just a lot of small doors left open. Here’s what happened.
## ⚡ Threat of the Week
C
Bugzilla
CVE-2026-92020 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
bugzilla·2026-09-15·CVSS 8.8
CVE-2026-92020 [HIGH] CVE-2026-92020 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
CVE-2026-92020 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component
Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
https://bugzilla.mozilla.org/show_bug.cgi?id=2066329https://www.mozilla.org/security/advisories/mfsa2026-90/https://www.mozilla.org/security/advisories/mfsa2026-91/https://www.mozilla.org/security/advisories/mfsa2026-92/https://www.mozilla.org/security/advisories/mfsa2026-93/https://www.mozilla.org/security/advisories/mfsa2026-94/https://www.mozilla.org/security/advisories/mfsa2026-95/https://www.mozilla.org/security/advisories/mfsa2026-96/
2026-09-15
Published