CVE-2021-23984

A malicious extension could have opened a popup window lacking an address bar

published March 31, 2021

CVSS
—
EPSS
1%
Percentile
65.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01113 · 65.7th percentile
Published
2021-03-31T13:41Z
EPSS history
Timeline
  • 31 MAR 13:41Z
    A malicious extension could have opened a popup window lacking an address bar
    cvelistv5