description: WebExtensions with the "ActiveTab" permission are able to access frames hosted within the active tab even if the frames are cross-origin. Malicious extensions can inject frames from arbitrary origins into the loaded page and then interact with them, bypassing same-origin user expectations with this permission. This vulnerability affects Firefox < 58.
problem types: WebExtension ActiveTab permission allows cross-origin frame content access
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 58, status: affected, version: unspecified, versionType: custom
}