Improper Restriction of Rendered UI Layers or Frames The advisory has been revoked - it doesn't affect any version of package thunderbird  (opens in a new tab)


Threat Intelligence

EPSS
0.28% (52nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-THUNDERBIRD-1041252
  • published18 Nov 2020
  • disclosed9 Dec 2020

Introduced: 18 Nov 2020

CVE-2020-26953  (opens in a new tab)
CWE-1021  (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.

It was possible to cause the browser to enter fullscreen mode without displaying the security UI; thus making it possible to attempt a phishing attack or otherwise confuse the user. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.