CVE-2026-74970
MediumPublished
Site isolation issue in the Graphics component
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Assigning CNA
- mozilla
- Evidence observed
- Aug 29, 2026
Primary CVSS
5.4/ 10Medium
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N0.2%
Low · next 30 days
- Percentile
- 4.5%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Sources
- TrespasserPoC
CVE-2026-74970, Fission site isolation bypass in Firefox WebRender
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