CVE-2020-26976

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CVSS 3.1

6.5 medium

EPSS

2%p75

Published

Jan 7, 2021 (Jan 7, 2021)

Modified

Jun 17, 2026

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.

Vendors: mozilla debian
Products: firefox, debian linux
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (1.6%)

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