A website was able to detect when a user took a screenshot of a page using the built-in Screenshot functionality in Firefox. This vulnerability affects Firefox < 127.
[
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "127",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]