CVE-2026-84137
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.
- Published Sep 1, 2026
- CVSS 4.3 medium
- 0.2% chance of exploitation in the next 30 days (EPSS)
- A fix is available