Vulnerability CVE-2021-39225
Published: 2021-10-25   Modified: 2021-10-26

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.

Type:

CWE-863

 (Incorrect Authorization)

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.5/10
4.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Nextcloud -> DECK 

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