CVE-2021-39225

8.1 highEPSS 1.3%

High (8.1) in nextcloud deck. EPSS 1.3% chance of exploitation in the next 30 days.

Nextcloud is an open-source, self-hosted productivity platform. A missing permission check in Nextcloud Deck before 1.2.9, 1.4.5 and 1.5.3 allows another authenticated users to access Deck cards of another user. It is recommended that the Nextcloud Deck App is upgraded to 1.2.9, 1.4.5 or 1.5.3. There are no known workarounds aside from upgrading.

Severity

CVSS 3.1

8.1 high

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

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 71% of CVEs (scores of 2026-10-31)
CWEs: CWE-862, CWE-639
Published: 2021-10-25
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:deck

References

https://github.com/nextcloud/deck/pull/3316
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72
https://hackerone.com/reports/1331728
https://github.com/nextcloud/deck/pull/3316
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72

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