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TI-2025-40968 Aliases CVE-2025-66557

Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other non-owners

Priority LOW 24CWE-284Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

Nextcloud Deck is a kanban style organization tool aimed at personal planning and project organization for teams integrated with Nextcloud. Prior to 1.14.6 and 1.15.2, a bug in the permission logic allowed users with "Can share" permission to modify the permissions of other recipients. This vulnerability is fixed in 1.14.6 and 1.15.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00299 22nd percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 1.15.2, 1.14.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisories1.15.0-beta.1 to before 1.15.2; before 1.14.61.15.2, 1.14.6Patch availableCNA
  • security-advisories Vendornextcloud Affected 1.15.0-beta.1 to before 1.15.2; before 1.14.6 Fixed in 1.15.2, 1.14.6 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:*1.14.0 to before 1.14.6; 1.15.0 to before 1.15.2Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:deck:*:*:*:*:*:*:*:* Versions 1.14.0 to before 1.14.6; 1.15.0 to before 1.15.2 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 1.15.2, 1.14.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66557

References

Patch 3

Advisory 1

  • 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-2021-16610 Missing permission check on Deck API CVSS 3.1HIGH 8.1
  • 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
See all 16 →

Sources

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