description: A "data:" URL loaded in a new tab did not inherit the Content Security Policy (CSP) of the original page, allowing for bypasses of the policy including the execution of JavaScript. In prior versions when "data:" documents also inherited the context of the original page this would allow for potential cross-site scripting (XSS) attacks. This vulnerability affects Firefox < 57.
problem types: data: URLs opened in new tabs bypass CSP protections
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 57, status: affected, version: unspecified, versionType: custom
}