---
cve: "CVE-2023-23943"
severity: "MEDIUM"
cvss: 5.0
epss: "0.9%"
vendor: "nextcloud"
kev: false
exploited: false
published: "2023-02-06 20:18:33"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T06:22:04+02:00"
---

# CVE-2023-23943

> 5.0 MEDIUM · 🧪 PoC

## Beschreibung

Nextcloud mail is an email app for the nextcloud home server platform. In affected versions the SMTP, IMAP and Sieve host fields allowed to scan for internal services and servers reachable from within the local network of the Nextcloud Server. It is recommended that the Nextcloud Maill app is upgraded to 1.15.0 or 2.2.2. The only known workaround for this issue is to completely disable the nextcloud mail app.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/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 | Verändert | bad |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 778e748e37109149f8168a6cbbd1c3366594ff1b (Commit)
- 90f9720bb3a5bb7d92c7dc12e45cd1752b3c22ed (Commit)

## Referenzen

- <https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6>
- <https://github.com/nextcloud/mail/pull/7796>
- <https://hackerone.com/reports/1736390>
- <https://hackerone.com/reports/1741525>
- <https://hackerone.com/reports/1746582>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-23943) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_