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threat intel
Inaudible sounds used to fingerprint browsers catch AliExpress red-handed
AliExpress deployed obfuscated browser fingerprinting scripts that generate inaudible sounds through WebAudio, which a researcher discovered after the technique disrupted his Bluetooth multipoint headphones. The scripts analyze sound wave patterns from each visitor's browser to create tracking identifiers. Users cannot hear the audio, but the technique enables persistent device identification across sessions.
Why it matters: Website visitors and Bluetooth users are unknowingly fingerprinted via audio analysis, creating tracking profiles without consent; practitioners should audit web properties for similar obfuscated fingerprinting techniques and consider detection or blocking mechanisms.
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