CVE-2021-37631
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.
Does this matter?
Lower severity and a low EPSS score (1.28%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 1.28% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-639
- Affected
- nextcloud/deck
- Source
- security-advisories@github.com
EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.