CVE-2026-6774
published 2026-04-21CVE-2026-6774: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
PriorityP426medium5.4CVSS 3.1
AVNACLPRLUIRSCCLILAN
EPSS
0.15%
5.0th percentile
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150 | Firefox 150 |
| mozilla | firefox | < 150.0 | 150.0 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | < 150.0 | 150.0 |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
vendor_redhat5.4MEDIUM
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Red Hat
Firefox: Firefox: Mitigation bypass in DOM Security component
vendor_redhat·2026-04-21·CVSS 5.4
CVE-2026-6774 [MEDIUM] CWE-358 Firefox: Firefox: Mitigation bypass in DOM Security component
Firefox: Firefox: Mitigation bypass in DOM Security component
A flaw was found in Firefox. This vulnerability allows for a mitigation bypass within the Document Object Model (DOM) Security component. An attacker could potentially exploit this to circumvent existing security controls, which may lead to further security compromises.
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6774
vendor_mozilla·CVSS 5.4
CVE-2026-6774 [MEDIUM] Mozilla Foundation Security Advisory 2026-33: CVE-2026-6774
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6774
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6774
vendor_mozilla·CVSS 5.4
CVE-2026-6774 [MEDIUM] Mozilla Foundation Security Advisory 2026-30: CVE-2026-6774
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6774
Product: Firefox
Impact: high
Fixed in: Firefox 150
GHSA
GHSA-gp6f-8rr3-wxrg: Mitigation bypass in the DOM: Security component
ghsa_unreviewed·2026-04-21
CVE-2026-6774 [MEDIUM] CWE-693 GHSA-gp6f-8rr3-wxrg: Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150.
No detection rules found.
No public exploits indexed.
2026-04-21
Published