CVE-2026-8962
published 2026-05-19CVE-2026-8962: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
PriorityP342high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.37%
29.5th percentile
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 140.11.0 | 140.11.0 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.11 | Firefox ESR 140.11 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < Thunderbird 140.11 | Thunderbird 140.11 |
| mozilla | thunderbird | < 140.11 | 140.11 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vendor_redhat8.1HIGH
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Red Hat
firefox: Mitigation bypass in the DOM: Security component
vendor_redhat·2026-05-19·CVSS 8.1
CVE-2026-8962 [HIGH] CWE-358 firefox: Mitigation bypass in the DOM: Security component
firefox: Mitigation bypass in the DOM: Security component
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Mitigation bypass in the DOM: Security 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: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affected
Package: firefox (Red Hat Enterprise Linux 8) - Affected
Package: firefox (Red Hat Enterprise Linux 9) - Affected
Mozilla
Mozilla Foundation Security Advisory 2026-48: CVE-2026-8962
vendor_mozilla
CVE-2026-8962 Mozilla Foundation Security Advisory 2026-48: CVE-2026-8962
Mozilla Foundation Security Advisory 2026-48
CVE: CVE-2026-8962
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.11
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8962
vendor_mozilla
CVE-2026-8962 Mozilla Foundation Security Advisory 2026-50: CVE-2026-8962
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8962
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8962
vendor_mozilla
CVE-2026-8962 Mozilla Foundation Security Advisory 2026-46: CVE-2026-8962
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8962
Product: Firefox
Impact: high
Fixed in: Firefox 151
Mozilla
Mozilla Foundation Security Advisory 2026-51: CVE-2026-8962
vendor_mozilla
CVE-2026-8962 Mozilla Foundation Security Advisory 2026-51: CVE-2026-8962
Mozilla Foundation Security Advisory 2026-51
CVE: CVE-2026-8962
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.11
VulDB
Mozilla Firefox up to 150 Security Remote Code Execution
vuldb·2026-05-19
CVE-2026-8962 [CRITICAL] Mozilla Firefox up to 150 Security Remote Code Execution
A vulnerability classified as critical was found in Mozilla Firefox up to 150. This affects an unknown function of the component Security Component. Such manipulation leads to Remote Code Execution.
This vulnerability is listed as CVE-2026-8962. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is advised.
GHSA
GHSA-93x2-246x-h3jh: Mitigation bypass in the DOM: Security component
ghsa_unreviewed·2026-05-19
CVE-2026-8962 [HIGH] CWE-693 GHSA-93x2-246x-h3jh: Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
No detection rules found.
No public exploits indexed.
2026-05-19
Published