VDB
CVE-2026-74955
CVE-2026-74955
PUBLISHED
CVSS 8.8 HIGH
Reported by mozilla · Published August 18, 2026
Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
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 | 153.1, 154 |
| Mozilla | Thunderbird | 153.1, 154 |
| wolfi | firefox | 0, 0, 0 |
| chainguard | firefox | 0, 0, 0 |
| Mozilla | Firefox | 154, 153.1, 154 |
| Mozilla | Thunderbird | 153.1, 154, 153.1 |
Timeline
- Aug 18, 2026 Coalition ESS Score
- Aug 18, 2026 CVE Published
- Aug 24, 2026 EPSS Score
- Sep 5, 2026 EPSS Score
- Sep 5, 2026 Security Advisory
- Sep 12, 2026 EPSS Score
- Sep 17, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 26, 2026 EPSS Score
- Sep 30, 2026 EPSS Score
- Oct 2, 2026 EPSS Score