CVE-2025-66557 MEDIUM

CVE-2025-66557: Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other non-owners

Vendor Nextcloud
Product security-advisories
Weakness CWE-284
Published December 5, 2025
Last update December 8, 2025
View on NVD All CVEs

CVSS base score

5.4/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 5, 2025 CVE published
December 8, 2025 Record updated