Medium (4.3). EPSS 0.9% chance of exploitation in the next 30 days.
A website could have obscured the fullscreen notification by using a dropdown select input element. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 123, Firefox ESR < 115.8, and Thunderbird < 115.8.
Severity
CVSS 3.1
4.3 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS
0.9% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)