VDB
CVE-2026-84128
CVE-2026-84128
PUBLISHED
CVSS 8.8 HIGH
Reported by mozilla · Published September 1, 2026
Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
Risk Scores
CVSS 3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 155 |
| Mozilla | Thunderbird | 155 |
| Mozilla | Thunderbird | 155, 155 |
| Mozilla | Firefox | 155, 155 |
| chainguard | firefox | 0, 0 |
| wolfi | firefox | 0, 0, 0 |
Timeline
- Sep 1, 2026 Coalition ESS Score
- Sep 1, 2026 CVE Published
- Sep 2, 2026 EPSS Score
- Sep 2, 2026 CVE Updated
- Sep 4, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score