CVE-2021-39225

Name: CVE-2021-39225
Creator: NVD / NIST
Published: 2021-10-25T22:15:07.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.29%

Last modified Jun 17, 2026

CVE-2021-39225 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Deck	< 1.2.9
Nextcloud	Deck	>= 1.3.0, < 1.4.5
Nextcloud	Deck	>= 1.5.0, < 1.5.3

References

https://github.com/nextcloud/deck/pull/3316Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72Third Party Advisory
https://hackerone.com/reports/1331728Permissions Required, Third Party Advisory
https://github.com/nextcloud/deck/pull/3316Patch, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72Third Party Advisory
https://hackerone.com/reports/1331728Permissions Required, Third Party Advisory

Timeline

Published: Oct 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39225?

How severe is CVE-2021-39225?

CVE-2021-39225 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39225?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39225?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST