CVE-2026-6770
MediumPublished
Other issue in the Storage: IndexedDB component
- Published
- Apr 21, 2026
- Updated
- May 27, 2026
- Assigning CNA
- mozilla
- Evidence observed
- Aug 25, 2026
Primary CVSS
6.5/ 10Medium
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L4.7%
Low · next 30 days
- Percentile
- 91.4%
- Model date
- Sep 21, 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
Other issue in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Sources
1Proof-of-concept exploit for CVE-2026-6770 targeting Firefox and Tor browsers, demonstrating the vulnerability and enabling security researchers to test and understand the flaw.
Responsible use
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