CVE-2026-92034
published 2026-09-15CVE-2026-92034: Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
PriorityP345critical9.1CVSS 3.1
AVNACLPRNUINSUCNIHAH
EPSS
0.27%
18.4th percentile
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 156.0.0 | 156.0.0 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < 156.0 | 156.0 |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Site isolation issue in the Graphics component
vendor_redhat·2026-09-15·CVSS 7.5
CVE-2026-92034 [HIGH] CWE-653 firefox: thunderbird: Site isolation issue in the Graphics component
firefox: thunderbird: Site isolation issue in the Graphics component
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Site isolation issue in the Graphics 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
Package: firefox (Red Hat Enter
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92034
vendor_mozilla
CVE-2026-92034 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92034
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92034
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92034
vendor_mozilla
CVE-2026-92034 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92034
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92034
Product: Firefox
Impact: low
Fixed in: Firefox 156
GHSA
Site isolation issue in the Graphics component.
ghsa_unreviewed·2026-09-15
CVE-2026-92034 Site isolation issue in the Graphics component.
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156.
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-2026-92034 firefox: thunderbird: Site isolation issue in the Graphics component
bugzilla·2026-09-15
CVE-2026-92034 [HIGH] CVE-2026-92034 firefox: thunderbird: Site isolation issue in the Graphics component
CVE-2026-92034 firefox: thunderbird: Site isolation issue in the Graphics component
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 156.
2026-09-15
Published