AliExpress, the massive Chinese e-commerce platform, has been caught red-handed employing an invasive tracking technique that uses inaudible ultrasonic sounds to fingerprint and identify browsers—a discovery that underscores the increasingly sophisticated methods companies deploy to surveil users online.
What Happened
Security researchers uncovered that AliExpress embedded ultrasonic beacons into its website, emitting sounds above the human hearing range (typically between 18-20 kHz) to create unique browser fingerprints. These inaudible sounds interact with a user’s device hardware in distinct ways, allowing the platform to identify and track individual browsers across sessions and even across different websites. The technique represents a particularly invasive form of surveillance because users have no way of knowing it’s happening.
Key Points
Browser fingerprinting has long been a concern for privacy advocates, but ultrasonic methods represent a new frontier in tracking technology. Unlike traditional cookies or tracking pixels that users might block with privacy tools, inaudible sound-based identification is far more difficult to detect and prevent. The discovery raises serious questions about what other major platforms might be employing similar techniques without users’ knowledge or consent. AliExpress’s use of this method suggests it’s willing to deploy cutting-edge surveillance technology to maintain detailed profiles of user behavior and browsing habits.
The implications extend beyond simple behavioral tracking. By creating persistent, hardware-based identifiers, AliExpress can potentially link user activities across different browsers, incognito modes, and devices—circumventing many standard privacy protections consumers rely on. This level of tracking enables hyper-targeted advertising and detailed consumer profiling that goes far beyond what most users would consider acceptable.
What This Means
For privacy-conscious internet users, this discovery serves as a stark reminder that invasive tracking methods continue evolving faster than regulatory frameworks can address them. While privacy regulations like GDPR and emerging laws in various U.S. states require explicit consent for tracking, ultrasonic fingerprinting exists in a murky gray area where many users remain completely unaware it’s occurring.
The revelation may intensify calls for stronger digital privacy legislation and increased scrutiny of e-commerce platforms’ data practices. Regulators and security researchers will likely investigate whether other major retailers and tech companies employ similar tactics. For consumers, it underscores the importance of using privacy-focused browsers, VPNs, and ad-blocking tools to maintain some measure of anonymity online in an increasingly invasive digital landscape.
