CVE-2021-37631

Deck is an open source kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. In affected versions the Deck application didn't properly check membership of users in a Circle. This allowed other users in the instance to gain access to boards that have been shared with a Circle, even if the user was not a member of the circle. It is recommended that Nextcloud Deck is upgraded to 1.5.1, 1.4.4 or 1.2.9. If you are unable to update it is advised to disable the Deck plugin.

• CWE-639
• CWE-639

• https://github.com/nextcloud/deck/pull/3217Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hrThird Party Advisory
• https://hackerone.com/reports/1256021Permissions Required, Third Party Advisory
• https://hackerone.com/reports/1280931Permissions Required, Third Party Advisory
• https://github.com/nextcloud/deck/pull/3217Patch, Third Party Advisory
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hrThird Party Advisory
• https://hackerone.com/reports/1256021Permissions Required, Third Party Advisory
• https://hackerone.com/reports/1280931Permissions Required, Third Party Advisory

Published

Sep 7, 2021

Last Modified

Jun 17, 2026

Status

Modified

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