CVE-2025-66557
Title: Nextcloud Deck Permission Logic Bug
Other
Proof Of Concept
No public PoC currently indexed for CVE-2025-66557.
CWE Category
CWE-284
Published Date
Dec 05, 2025
Modified Date
Sep 25, 2026
Exploit Status
Not Found
Score
5.4
CVSS v3.1
Exploit Probability (EPSS)
0.28%
Vulnerability Summary
CVE-2025-66557: 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.
CVSS v3.1
Source Entity
[email protected]
Severity
MEDIUM
5.4
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CVSS v3.1
Source Entity
[email protected]
Severity
MEDIUM
4.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Associated Attack Patterns (CAPEC)
Total: PatternsNo specific attack patterns mapped.
Likelihood
Severity
Page /
CVE-2025-66557 Exploits & PoCs (Proof Of Concept)
No public PoCs found in our database for this CVE.
MODIFIED
Vulnerability data updated via NVD.
MODIFIED
Vulnerability data or affected products updated.
MODIFIED
Vulnerability data updated via NVD.
PUBLISHED
Vulnerability first announced in NVD.
Attack Vector Matrix
Access Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
CVSS Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Affected Stack
No specific products linked.