Read the docs
TI-2021-16610 Aliases CVE-2021-39225

Missing permission check on Deck API

Priority LOW 38CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

EPSS 0.01336 71st percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 1.2.9, 1.4.5, 1.5.3

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisoriesbefore 1.2.9; 1.4.0 to before 1.4.5; 1.5.0 to before 1.5.31.2.9, 1.4.5, 1.5.3Patch availableCNA
  • security-advisories Vendornextcloud Affected before 1.2.9; 1.4.0 to before 1.4.5; 1.5.0 to before 1.5.3 Fixed in 1.2.9, 1.4.5, 1.5.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*before 1.2.9; 1.3.0 to before 1.4.5; 1.5.0 to before 1.5.3Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:* Versions before 1.2.9; 1.3.0 to before 1.4.5; 1.5.0 to before 1.5.3 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 1.2.9, 1.4.5, 1.5.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39225

References

Patch 1

Advisory 2

  • TI-2023-08718 Nextcloud Deck card vulnerable to data leak to unauthorized users via reference preview cache CVSS 3.1MEDIUM 5.8
  • TI-2022-11703 Possibility for anyone to add a stack with existing tasks on anyone's board in Nextcloud Deck CVSS 3.1MEDIUM 5.0
  • TI-2022-08716 Error in deleting deck cards attachment reveals the full application path in Nextcloud Deck CVSS 3.1MEDIUM 4.3
  • TI-2020-06600 Improper access control in Nextcloud Deck CVSS 3.1HIGH 8.0
  • TI-2021-05774 Information disclosure in Nextcloud Deck CVSS 3.1MEDIUM 6.5
  • TI-2021-15506 Circle can be accessed by non-Circle members in Nextcloud Deck CVSS 3.1MEDIUM 6.5
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences