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…

EPSS: 0.002 (14.0th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

References

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.