CVE-2020-26976

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.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.57%

Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory debian.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2020-54/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1674343	issue tracking permissions required vendor advisory
https://www.debian.org/security/2021/dsa-4840	third party advisory vendor advisory
https://security.gentoo.org/glsa/202102-02	third party advisory vendor advisory
https://www.debian.org/security/2021/dsa-4842	third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2021/02/msg00002.html	third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2021/02/msg00001.html	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2020-26976?: CVE-2020-26976 has been scored as a medium severity vulnerability.
How to fix CVE-2020-26976?: To fix CVE-2020-26976, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26976 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-26976 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-26976?: CVE-2020-26976 affects Mozilla Firefox.

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