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CVE-2021-37631

22
FAUCET Score

CVE-2021-37631 describes an access control vulnerability in Nextcloud Deck, an open-source kanban tool. The flaw allowed unauthorized users to access boards shared with a Circle, even if they were not members of that Circle, due to improper membership checks. Rated Medium severity (CVSS 6.5), this vulnerability has a network attack vector and low attack complexity, potentially leading to high confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.9CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
>= 1.3.0, < 1.4.4CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*
>= 1.5.0, < 1.5.1CPE matchmatch criteria
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 81st percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / nextcloud/deck/pull/3217
PatchThird Party Advisory
github.com / nextcloud/security-advisories/security/advisories/GHSA-4mxp-j277-82hr
Third Party Advisory
hackerone.com / reports/1256021
Permissions RequiredThird Party Advisory
hackerone.com / reports/1280931
Permissions RequiredThird Party Advisory