VULNERABILITY INTELLIGENCE

CVE-2021-23984

CVSS score6.5 MEDIUM

EPSS probability1.11%

CISA KEVNot currently listed

Published2021-03-31

Last modified2026-06-17

Description

A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.