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Thumbnails of files leaked via Android content provider (NC-SA-2019-007)

26th July 2019

Risk level: Low

CVSS v3 Base Score: 4.3 (AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N)

CWE: Improper Access Control (CWE-284)

HackerOne report: 534541


If an attacker has physical access to an Android smartphone without a screen lock, but with nextcloud installed and set up, he can easily access the nextcloud-files even if the nextcloud app is locked with a fingerprint or pin.

Affected Software

  • Nextcloud Android < 3.6.2 (CVE-2019-5452)

Action Taken

The error has been fixed.


It is recommended that users upgrade to version 3.6.2.


The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

This advisory is licensed CC BY-SA 4.0.

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