VDB
CVE-2026-109756
CVE-2026-109756
PUBLISHED
CVSS 8.8 HIGH
Reported by mozilla · Published October 13, 2026
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
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 | 153.5, 158 |
| Mozilla | Thunderbird | 153.5, 158 |
| chainguard | firefox-esr-140 | 0 |
| Mozilla | Firefox | 153.5, 158 |
| Mozilla | Thunderbird | 153.5, 158 |
Timeline
- Oct 13, 2026 Coalition ESS Score
- Oct 13, 2026 CVE Published
- Oct 14, 2026 EPSS Score
- Oct 14, 2026 CVE Updated
- Oct 17, 2026 EPSS Score
- Oct 20, 2026 EPSS Score
- Oct 21, 2026 EPSS Score
- Oct 24, 2026 EPSS Score
- Oct 25, 2026 EPSS Score
- Oct 29, 2026 EPSS Score
- Oct 31, 2026 Distribution Patch
- Oct 31, 2026 Security Advisory