For native-to-JS bridging the app requires a unique token to be passed that ensures non-app code can’t call the bridging functions. That token could leak when used for downloading files. This vulnerability affects Firefox for iOS < 26.
[
{
"product": "Firefox for iOS",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "26",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]