CVE-2025-66557 | BDVDB-2026-304102 Detail

nextcloudsecurity-advisories

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact low. Attack vector: network.

Weaknesses#

CWE-284 Improper Access Control

References#

Exploit#

No public exploit known

History#

Version 12025-12-05Record published in the CVE List.
Version 22025-12-08Most recent update recorded in the CVE List.

Published

Published: 2025-12-05
Last modified: 2025-12-08

Vendor information

Vendor: nextcloud
Product: security-advisories

All nextcloud vulnerabilities

Score

5.4 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 22.8.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Improper Access Control

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 1.15.0-beta.1, < 1.15.2
Fixed
Not stated
Vulnerable
< 1.14.6
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

5.4 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	Low

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).