CVE-2020-26976
Moderate
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.
Exploit probability
1.6%
Published
January 7, 2021
Required by
Not available
Last source change
April 16, 2026
02 / AFFECTED SOFTWARE
Affected packages
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
Open Source Vulnerabilities
CVE-2020-26976
View original source
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.
05 / REFERENCES
Further evidence
- https://bugzilla.mozilla.org/show_bug.cgi?id=1674343
- https://lists.debian.org/debian-lts-announce/2021/02/msg00001.html
- https://lists.debian.org/debian-lts-announce/2021/02/msg00002.html
- https://security.gentoo.org/glsa/202102-02
- https://www.debian.org/security/2021/dsa-4840
- https://www.debian.org/security/2021/dsa-4842
- https://www.mozilla.org/security/advisories/mfsa2020-54/