MEDIUM 6.5
CVE-2021-23984
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.
CVSS v3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS
0.2%
percentile 43.7%
Affected tracked apps
Vulnerable CPE configurations
| Vendor | Product | Platform | Versions | CPE 2.3 URI |
|---|---|---|---|---|
| mozilla | thunderbird | Windows | <78.9 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |