Security Advisory

Name of private conversations leaked when linked via projects to a shared item (NC-SA-2020-011)

29th July 2019

Risk level: Low

CVSS v3 Base Score: 2 (AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N)

CWE: Improper Access Control (CWE-284)

HackerOne report: 662218

Description

Improper access control in Nextcloud Talk 6.0.3 leaks the existance and the name of private conversations when linked them to another shared item via the projects feature.

Affected Software

• Nextcloud Talk < 6.0.4 (CVE-2019-15620)

Action Taken

The error has been fixed.

Resolution

It is recommended that the Nextcloud Talk 6.0.3 is upgraded to 6.0.4.

Acknowledgements

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

• Tim Coen - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.