Vulnerability in Mozilla Firefox
CVE-2026-92030
Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2026-90/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-92/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-93/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-95/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-94/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-96/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-92030?
- CVE-2026-92030 is a medium-severity vulnerability in Mozilla Firefox, classified under Protection Mechanism Failure. CVSS score: 5.4/10. Published 2026-09-15.
- How severe is CVE-2026-92030?
- Medium severity. CVSS v3 base score is 5.4 out of 10.