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Access control missing while viewing the attachments in the 'All boards' (NC-SA-2020-036)

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.

Affected Software

  • Nextcloud Deck < 1.0.5 (CVE-2020-8235)

Action Taken

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:

  • Divyesh Prajapati - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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