VDB
CVE-2026-74981
CVE-2026-74981
PUBLISHED
CVSS 8.1 HIGH
Reported by mozilla · Published August 18, 2026
Site isolation issue in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Risk Scores
CVSS 3.1
8.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 153.1, 154 |
| Mozilla | Thunderbird | 153.1, 154 |
| 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 20, 2026 CVE Updated
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Sep 5, 2026 Security Advisory
- Sep 16, 2026 EPSS Score
- Sep 24, 2026 EPSS Score
- Sep 26, 2026 EPSS Score
- Oct 6, 2026 EPSS Score