VDB
CVE-2026-74963
CVE-2026-74963
PUBLISHED
CVSS 5.4 MEDIUM
Reported by mozilla · Published August 18, 2026
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Risk Scores
CVSS 3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 140.14, 153.1, 154 |
| Mozilla | Thunderbird | 140.14, 153.1, 154 |
| chainguard | firefox | 0, 0, 0 |
| Mozilla | Thunderbird | 153.1, 154, 140.14 |
| Mozilla | Firefox | 154, 140.14, 153.1 |
| wolfi | firefox | 0, 0, 0 |
Timeline
- Aug 18, 2026 Coalition ESS Score
- Aug 18, 2026 CVE Published
- Aug 18, 2026 CVE Updated
- Aug 24, 2026 EPSS Score
- Aug 24, 2026 Distribution Patch
- Aug 24, 2026 Security Advisory
- Aug 24, 2026 Distribution Patch
- Aug 24, 2026 Security Advisory
- Aug 25, 2026 Distribution Patch
- Aug 25, 2026 Security Advisory
- Sep 3, 2026 Distribution Patch
- Sep 4, 2026 Distribution Patch