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UC Browser app abuses and exposed 500 million users

ID: 467d8e42-93be-5299-908d-de67a7cb2b9b

STIX ID: report--467d8e42-93be-5299-908d-de67a7cb2b9b

Feed Name: Zscaler Security Research Blog

Threat Score
70/100

Date Published: 2025-04-02

Date Updated: 2026-05-01

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**Executive Summary:** The report by Zscaler's ThreatLabZ documents that UC Browser and UC Mini (installed hundreds of millions of times) downloaded a third-party APK (the 9Apps store) over unsecured HTTP and wrote it to world-readable external storage, creating opportunities for man-in-the-middle interception, tampering, and arbitrary payload installation; Zscaler reported the behavior to Google, which confirmed the policy violation and prompted remediation.

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