CVE-2020-26953

Mozilla: Fullscreen could be enabled without displaying the security UI

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Severity

Moderate

Red Hat Product Security

4.3

CVSS 3.1

Review impact separately from score.

Published · November 17, 2020

Updated · November 22, 2025

Description

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CWE-451 · User Interface (UI) Misrepresentation of Critical Information