CVE-2020-26976 The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)


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EPSS
0.57% (68th percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1051836
  • published16 Dec 2020
  • disclosed7 Jan 2021

Introduced: 16 Dec 2020

CVE-2020-26976  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Ubuntu.

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.