---
cve: "CVE-2023-39954"
severity: "LOW"
cvss: 3.8
epss: "0.4%"
vendor: "nextcloud"
kev: false
exploited: false
published: "2023-08-10 15:15:09"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T12:58:58+02:00"
---

# CVE-2023-39954

> 3.8 LOW · 🧪 PoC

## Beschreibung

user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, an attacker that obtained at least read access to a snapshot of the database can impersonate the Nextcloud server towards linked servers. user_oidc 1.3.3 contains a patch. No known workarounds are available.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 3ff24f81b96792d96a2647d7b1f857b891c84643 (Commit)

## Referenzen

- <https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3f92-5c8p-f6gq>
- <https://github.com/nextcloud/user_oidc/pull/636>
- <https://hackerone.com/reports/1994328>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-39954) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_