Vulnerability in Nextcloud Deck
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (18.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Nextcloud Deck
- Nextcloud Security-Advisories — versions >= 1.15.0-beta.1, < 1.15.2, < 1.14.6
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv (Patch, Vendor Advisory)
- github.com/nextcloud/deck/pull/7131 (Patch, Issue Tracking)
- github.com/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae (Patch)
- hackerone.com/reports/3247499 (Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66557?
- CVE-2025-66557 is a medium-severity vulnerability in Nextcloud Deck, classified under Improper Access Control. CVSS score: 5.4/10. Published 2025-12-05.
- How severe is CVE-2025-66557?
- Medium severity. CVSS v3 base score is 5.4 out of 10.