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Limit contacts photo uploading to images (NC-SA-2020-024)

16th April 2020

Risk level: Low

CVSS v3 Base Score: 2.6 (AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N)

CWE: Business Logic Errors (CWE-840)

HackerOne report: 808287


A missing file type check in Nextcloud Contacts 3.2.0 allowed a malicious user to upload any file as avatars.

Affected Software

  • Nextcloud Contacts < 3.3.0 (CVE-2020-8181)

Action Taken

The error has been fixed.


It is recommended that the Nextcloud Contacts is upgraded to 3.3.0.


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

  • Tommy Suriel - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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