CVE-2025-66557

4.3 mediumEPSS 0.3%

Medium (4.3) in nextcloud deck. EPSS 0.3% chance of exploitation in the next 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.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-31)
CWE: CWE-284
Published: 2025-12-05
Modified: 2026-09-25
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:deck

References

https://github.com/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae
https://github.com/nextcloud/deck/pull/7131
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv
https://hackerone.com/reports/3247499

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