Share tokens for public calendars disclosed (NC-SA-2017-011)
8th May 2017
Risk level: Medium
CVSS v3 Base Score: 4.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
HackerOne report: 218876
A logical error caused disclosure of valid share tokens for public calendars. Thus granting an attacker potentially access to publicly shared calendars without knowing the share token.
- Nextcloud Server < 11.0.3 (CVE-2017-0894)
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:
- Lukas Reschke - Nextcloud GmbH (firstname.lastname@example.org) - Vulnerability discovery and disclosure.
This advisory is licensed CC BY-SA 4.0.