CVE-2020-26976
firefox-esr - security update
6.5
MEDIUM
CVSS 3.1
EPSS 1.3%
Description
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.
How to fix CVE-2020-26976
To remediate CVE-2020-26976, upgrade the affected package to a fixed version below.
- —upgrade to 78.7.0esr-1 or later
- —upgrade to 78.7.0esr-1~deb9u1 or later
- —upgrade to 78.7.0esr-1~deb10u1 or later
- —upgrade to 1:78.7.0-1 or later
Is CVE-2020-26976 being exploited?
Low — EPSS is 1.3%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 78.7.0esr-1
- from 0, < 78.7.0esr-1~deb9u1
- from 0, < 78.7.0esr-1~deb10u1
- from 0, < 1:78.7.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N |