Security Advisory

Improper access control checks for single share previews (NC-SA-2018-014)

25th October 2018

Risk level: Low

CVSS v3 Base Score: 4.8 (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N)

CWE: Improper Authentication (CWE-287)

HackerOne report: 231917

Description

A missing check could give unauthorized access to the previews of single file password protected shares.

Affected Software

• Nextcloud Server < 14.0.0 (CVE assignment pending)

Action Taken

The error has been fixed.

Resolution

It is recommended that all instances are upgraded to Nextcloud 14.0.0.

Acknowledgements

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

• Carl Pearson - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.