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Calendar and addressbook names disclosed (NC-SA-2017-012)

8th May 2017

Risk level: Low

CVSS v3 Base Score: 3.5 (AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N)

CWE: Information Exposure Through Directory Listing (CWE-548)

HackerOne report: 203594


A logical error caused disclosure of calendar and addressbook names to other logged-in users. Note that no actual content of the calendar and adressbook has been disclosed.

Affected Software

  • Nextcloud Server < 11.0.2 (CVE-2017-0895)
  • Nextcloud Server < 10.0.4 (CVE-2017-0895)

Action Taken

The error has been fixed and regression tests been added.


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.