CVE-2026-84137
mediumSpoofing issue in the DOM: Core & HTML component.
Vendor / product: Mozilla — firefox
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
CVSS
4.3
4.3 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-01 13:20
Modified: 2026-09-03 18:17
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-10-27 06:50 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox <153.2.0, ≥154.0.0 <155.0.0
mozilla / thunderbird <153.2.0, ≥154.0 <155.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-82/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-85/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-86/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-88/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2051146 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-82/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-85/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-86/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-88/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗