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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.


It is recommended that all instances are upgraded to Nextcloud 11.0.3.


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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