Security Advisory

Back to advisories

Bypass lock protection in Android app (NC-SA-2019-004)

26th July 2019

Risk level: Low

CVSS v3 Base Score: 5.9 (AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N)

CWE: Authentication Bypass Using an Alternate Path or Channel (CWE-288)

HackerOne report: 490946


Creating a fake multi-account and aborting the process would redirect the user to the default account of the device without asking for the lock pattern if one was set up.

Affected Software

  • Nextcloud Android < 3.6.1 (CVE-2019-5455)

Action Taken

The error has been fixed.


It is recommended that users upgrade to version 3.6.1.


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.

You have javascript disabled. We tried to make sure the basics of our website work but some functionality will be missing.

This website is using cookies. By visiting you agree with our privacy policy. That's Fine