---
cve: "CVE-2025-66557"
severity: "MEDIUM"
cvss: 5.4
epss: "0.3%"
vendor: "nextcloud"
kev: false
exploited: false
published: "2025-12-05 18:15:58"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T00:38:19+02:00"
---

# CVE-2025-66557

> 5.4 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 9f6d33e3374fed6bdd1704e5b551376db549acec (Commit)
- dbdfe16e9fcc22fd86f970051e93075d540d2017 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-66557) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_