Vulnerability in Mozilla Firefox
CVE-2020-26976
When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. This vulnerability affects Firefox < 84.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.016 (75.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: +0.001
Affected products
- Mozilla Firefox — versions unspecified
- Debian Linux — versions 9.0, 10.0
References
- www.mozilla.org/security/advisories/mfsa2020-54/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking, Vendor Advisory)
- www.debian.org/security/2021/dsa-4840 (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202102-02 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2021/dsa-4842 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00002.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/02/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-26976?
- CVE-2020-26976 is a medium-severity vulnerability in Mozilla Firefox. CVSS score: 6.5/10. Published 2021-01-07.
- How severe is CVE-2020-26976?
- Medium severity. CVSS v3 base score is 6.5 out of 10.