CVE-2026-6774 json
Mitigation bypass in the DOM: Security component
published 2026-04-21 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-24115
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
Patch / fix
- mozilla firefox 150.0
- mozilla thunderbird 150.0
- firefox-esr openSUSE Tumbleweed 153.0-1.1
- MozillaFirefox openSUSE Tumbleweed 150.0-1.1
opensuse advisories openSUSE-SU-2026:11373-1openSUSE-SU-2026:10626-1
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-6774 updated cvss 3.4
firefox: thunderbird: Mitigation bypass in the DOM: Security component
-
Red Hat Enterprise Linux 6 thunderbird Red Hat Enterprise Linux 7 thunderbird Red Hat Enterprise Linux 8 thunderbird Red Hat Enterprise Linux 9 thunderbird Red Hat Enterprise Linux 10 thunderbird, rhel10/thunderbird-flatpaknot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected products
- Mozilla Firefox
- Mozilla Thunderbird
Classification
- Weakness
-
- CWE-693 Protection Mechanism Failure
References
-
mozilla.org
/security/advisories/mfsa2026-30/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-33/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=2016915
permissions-required
Sources
- CVE List CVE-2026-6774
- NVD CVE-2026-6774
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