Medium severity6.5NVD Advisory· Published Sep 7, 2021· Updated Jun 17, 2026
CVE-2021-37631
CVE-2021-37631
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3- nextcloud/security-advisoriesv5Range: < 1.2.9
Patches
Vulnerability mechanics
References
4- github.com/nextcloud/deck/pull/3217nvdPatchThird Party Advisory
- github.com/nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hrnvdThird Party Advisory
- hackerone.com/reports/1256021nvdPermissions RequiredThird Party Advisory
- hackerone.com/reports/1280931nvdPermissions RequiredThird Party Advisory
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