After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. This vulnerability affects Firefox < 74.
CVSS Details
- CVSS 3.1 Base Score: 4.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | alpine-linux-upgrade-firefoxalpine-linux-upgrade-librewolf | Aug 22, 2024 | Mar 25, 2020 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Mar 25, 2020 | |
| Mfsa2020 08 | mozilla-firefox-upgrade-74_0 | Mar 11, 2020 | Mar 10, 2020 | |
| Redhat_linux | no-fix-redhat-rpm-package | Jul 9, 2025 | Mar 25, 2020 | |
| Ubuntu | ubuntu-upgrade-firefox | Mar 12, 2020 | Mar 11, 2020 |
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