CVE-2021-37631

mediumpriority · track · 26EPSS 0.013 · 70 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.28% (70th) EPSS

CVSS 4 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04mediumAV:N/AC:L/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-639USprimary

affected products (6)

Products and version ranges known to be affected.

nextcloud security-advisories≤ < 1.2.9enisa_euvdEU
nextcloud security-advisories1.3.0, → 1.4.4enisa_euvdEU
nextcloud security-advisories1.5.0, → 1.5.1enisa_euvdEU
nextcloud deck< 1.2.9nvdUScpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
nextcloud deck1.3.0 → 1.4.4nvdUScpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
nextcloud deck1.5.0 → 1.5.1nvdUScpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-09-07modified 2026-06-17

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+3331 more

references (13)

External citations — patches, advisories, analysis.

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