CVE-2026-92013
published 2026-09-15CVE-2026-92013: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL 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: CanvasWebGL 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
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 115.41.0 | 115.41.0 |
| mozilla | firefox | — | — |
| 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 115.41 | Firefox ESR 115.41 |
| mozilla | firefox_esr | < Firefox ESR 140.16 | Firefox ESR 140.16 |
| 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 | — | — |
| mozilla | thunderbird | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
| rhel10 | firefox-flatpak | — | — |
| 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
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
vendor_redhat·2026-09-15·CVSS 8.8
CVE-2026-92013 [HIGH] CWE-787 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL 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.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL 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) - Affected
Package: rhel
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-93: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92013
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-95: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92013
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-91: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92013
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-94: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92013
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-90: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92013
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-92: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92013
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92013
vendor_mozilla·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Foundation Security Advisory 2026-96: CVE-2026-92013
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92013
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
GHSA
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
ghsa_unreviewed·2026-09-15
CVE-2026-92013 [HIGH] CWE-120 Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component.
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL 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 CanvasWebGL privileges management (EUVD-2026-78476)
vuldb·2026-09-15·CVSS 8.8
CVE-2026-92013 [HIGH] Mozilla Firefox up to 115.40/140.15/153.2/155 CanvasWebGL privileges management (EUVD-2026-78476)
A vulnerability classified as critical has been found in Mozilla Firefox up to 115.40/140.15/153.2/155. This vulnerability affects unknown code of the component CanvasWebGL. The manipulation leads to improper privilege management.
This vulnerability is referenced as CVE-2026-92013. Remote exploitation of the attack is possible. No exploit is available.
It is recommended to upgrade the affected component.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-92013 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
bugzilla·2026-09-15·CVSS 8.8
CVE-2026-92013 [HIGH] CVE-2026-92013 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2026-92013 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
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
Home
Threat Intelligence
Vulnerabilities
Cyber Attacks
Webinars
Expert Insights
Awards
Webinars
Awards
Free eBooks
About THN
Jobs
Advertise with us
## ⚡ 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
https://bugzilla.mozilla.org/show_bug.cgi?id=2058078https://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