Meta and Yandex Have Both Been De-Anonymizing Android Users’ Ostensibly Sandboxed Private Web Browsing Identifiers

Daring Fireball
By John GruberJun 4, 2025, 5:53 pm244 pts
A team of researchers has uncovered a scheme they’ve dubbed “Local Mess” — used by Meta since September 2024, and Russian search engine Yandex since 2017 (!) — to de-anonymize Android users web browsing across millions of websites that include Meta’s and Yandex’s respective tracking…

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