Not rated
CVE-2021-23984 A malicious extension could have opened a popup window lacking an address bar
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox ESR 78.9 | earliest → < 78.9 | 78.9 |
| Firefox 87 | earliest → < 87 | 87 |
| Thunderbird 78.9 | earliest → < 78.9 | 78.9 |
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