Security Advisory

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Possible denial of service when entering a long password (NC-SA-2020-028)

16th June 2020

Risk level: Low

CVSS v3 Base Score: 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

CWE: Brute Force (CWE-307)

HackerOne report: 840598


Improper check of inputs in Preferred providers app 1.6.0 allowed to perform a denial of service attack when using a very long password.

Affected Software

  • Nextcloud Preferred_providers < 1.7.0 (CVE-2020-8202)

Action Taken

The error has been fixed.


It is recommended that the Preferred providers app is upgraded to 1.7.0.


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

  • Abhishek Raj ( - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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