CVE-2026-92018
published 2026-09-15CVE-2026-92018: Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3…
PriorityP346critical9.6CVSS 3.1
AVNACLPRNUIRSCCHIHAH
EPSS
0.33%
24.1th percentile
Sandbox escape in the DOM: Core & HTML 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 140.16 | Firefox ESR 140.16 |
| mozilla | firefox_esr | < Firefox ESR 153.3 | Firefox ESR 153.3 |
| mozilla | firefox_esr | < Firefox ESR 115.41 | Firefox ESR 115.41 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| 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
nvdv3.19.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component
vendor_redhat·2026-09-15·CVSS 7.5
CVE-2026-92018 [HIGH] CWE-791 firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component
firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component
Sandbox escape in the DOM: Core & HTML 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:
Sandbox escape in the DOM: Core & HTML 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: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Packa
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-92: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92018
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92018
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92018
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-95: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92018
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92018
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92018
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92018
vendor_mozilla
CVE-2026-92018 Mozilla Foundation Security Advisory 2026-91: CVE-2026-92018
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92018
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
VulDB
Mozilla Firefox up to 115.40/140.15/153.2/155 DOM/HTML sandbox (WID-SEC-2026-3375)
vuldb·2026-09-22·CVSS 9.6
CVE-2026-92018 [CRITICAL] Mozilla Firefox up to 115.40/140.15/153.2/155 DOM/HTML sandbox (WID-SEC-2026-3375)
A vulnerability was found in Mozilla Firefox up to 115.40/140.15/153.2/155 and classified as critical. This affects an unknown function of the component DOM/HTML. Executing a manipulation can lead to sandbox issue.
This vulnerability is registered as CVE-2026-92018. It is possible to launch the attack remotely. No exploit is available.
It is suggested to upgrade the affected component.
GHSA
Sandbox escape in the DOM: Core & HTML component.
ghsa_unreviewed·2026-09-15
CVE-2026-92018 Sandbox escape in the DOM: Core & HTML component.
Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2064287https://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