CVE-2020-26976

MEDIUM

Firefox < 84.0 - Service Worker Request Interception via Insecure Framing

Title source: llm
STIX 2.1

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.

References (7)

Core 7
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1674343
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4840
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202102-02
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2021/dsa-4842
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/02/msg00002.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/02/msg00001.html

Scores

CVSS v3 6.5
EPSS 0.0197
EPSS Percentile 83.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Details

Status published
Products (3)
debian/debian_linux 9.0
debian/debian_linux 10.0
mozilla/firefox < 84.0
Published Jan 07, 2021
Tracked Since Feb 18, 2026