---
cve: "CVE-2026-45275"
severity: "MEDIUM"
cvss: 6.5
epss: "0.4%"
vendor: "nextcloud"
kev: false
exploited: false
published: "2026-06-01 16:51:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-29T11:34:18+02:00"
---

# CVE-2026-45275

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

Nextcloud is an open source content collaboration platform. Prior to version 2.7.2, a privilege escalation vulnerability exists in the Approval app that allows a user without sharing permissions to force the system to share a file with approvers. This results in an authorization bypass and privilege escalation, allowing unauthorized distribution of restricted files. This issue has been patched in version 2.7.2.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

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

| 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 | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 1f41f41748dadf28b0da388110ee9da30b1dbf7b (Commit)

## BSI-Hinweise (deutsch)

- [Nextcloud: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1471)

## Referenzen

- <https://github.com/nextcloud/security-advisories/security/advisories/GHSA-v8q8-w6c3-3gv9>
- <https://github.com/nextcloud/approval/pull/392>
- <https://hackerone.com/reports/3593780>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45275) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_