CVE-2020-26953

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 83 Firefox ESR versions prior to 78.5 Thunderbird versions prior to 78.5

Description The issue allows the browser to enter fullscreen mode without displaying the security UI, making it possible to attempt a phishing attack or otherwise confuse the user.

Recommendations For Firefox versions prior to 83, update to version 83 or later. For Firefox ESR versions prior to 78.5, update to version 78.5 or later. For Thunderbird versions prior to 78.5, update to version 78.5 or later.