Medium 5.4Published Dec 5, 2025

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

Updated under an hour ago (Oct 27, 2026, 12:23 PM ET)

Does this affect you?

It affects nextcloud security-advisories and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for nextcloud security-advisories

Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Weakness (CWE): CWE-284
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Dec 8, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud security-advisories nextcloud:security_advisories (from the name)	from 1.15.0-beta.1, < 1.15.2; before 1.14.6	CNA record
nextcloud deck nextcloud:deck	from 1.14.0 before 1.14.6; from 1.15.0 before 1.15.2	NVD

References

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv	x-refsource-confirm, patch, vendor-advisory
https://github.com/nextcloud/deck/pull/7131	x-refsource-misc, issue-tracking, patch
https://github.com/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae	x-refsource-misc, patch
https://hackerone.com/reports/3247499	x-refsource-misc, issue-tracking, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.