CVE-2025-66557 json
Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other non-owners
published 2025-12-05 11 mo ago modified 2026-09-25 44 d ago also EUVD-2025-201465
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 22%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nextcloud deck 1.14.6, 1.15.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 11 mo ago
Exploit prediction
0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/nextcloud/deck/pull/7131
issue-tracking, patch
-
github.com
/nextcloud/deck/commit/f1da8b30a455f02373d44154da04494c949a95ae
patch
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-wwr8-hx9g-rjvv
patch, vendor-advisory
-
hackerone.com
/reports/3247499
issue-tracking, vendor-advisory
Sources
- CVE List CVE-2025-66557
- NVD CVE-2025-66557
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.