The com.superfast.video.downloader (aka Super Unlimited Video Downloader - All in One) application through 5.1.9 for Android allows an attacker to execute arbitrary JavaScript code via the com.bluesky.browser.ui.BrowserMainActivity component.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.