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CVE-2021-39225

Missing permission check on Deck API

HIGH
8.1
CVSS Score
Published: October 25, 2021 at 09:40 PM UTC
Updated: June 17, 2026 at 04:03 AM UTC
1 product affected across 1 vendorDeck

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Severity
HIGH8.1
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Deck· Nextcloudnextcloud-app
95%
v < 1.2.91.3.0 ≤ v < 1.4.51.5.0 ≤ v < 1.5.3
Affected range stops below 1.2.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.4.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.5.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/deck/pull/3316
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2x96-38qg-3m72
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1331728

CVSS

8.1HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-639CWE-862

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