description: Limitations on the URIs allowed to WebExtensions by the browser.windows.create API can be bypassed when a pipe in the URL field is used within the extension to load multiple pages as a single argument. This could allow a malicious WebExtension to open privileged about: or file: locations. This vulnerability affects Firefox < 64.
problem types: WebExtensions can load arbitrary URLs through pipe separators
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 64, status: affected, version: unspecified, versionType: custom
}