Vulnerabilities > CVE-2021-37631 - Authorization Bypass Through User-Controlled Key vulnerability in Nextcloud Deck
Attack vector
NETWORK Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
NONE Availability impact
NONE Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
References
- https://github.com/nextcloud/deck/pull/3217
- https://github.com/nextcloud/deck/pull/3217
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr
- https://hackerone.com/reports/1256021
- https://hackerone.com/reports/1256021
- https://hackerone.com/reports/1280931
- https://hackerone.com/reports/1280931