15th July 2020
Risk level: Low
CVSS v3 Base Score: 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
CWE: Insecure Direct Object Reference (IDOR) (CWE-639)
HackerOne report: 916704
Missing access control in Nextcloud Deck 1.0.4 caused an insecure direct object reference allowing an attacker to view all attachments.
The error has been fixed.
It is recommended that the Nextcloud Deck is upgraded to 1.0.5.
The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory: