Nextcloud: Mehrere Schwachstellen
WID-SEC-2023-0824 · first 03.04.2023 · updated 10.02.2026 · CVSS 9,0
What it is about
Nextcloud ist eine "on-premise" Plattform für Dateifreigabe und Zusammenarbeit. Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Nextcloud ausnutzen, um beliebigen Programmcode auszuführen oder Informationen offenzulegen.
Under what conditions?
Over the network, but only with valid access (login required), for example with stolen credentials or as an insider.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen oder Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Nextcloud Nextcloud <14.0.9 Talk
- Nextcloud Nextcloud <15.0.4 Talk
- Nextcloud Nextcloud <24.0.10 Server
- Nextcloud Nextcloud <25.0.4 Server
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Nextcloud Nextcloud 14.0.9 Talk
- Nextcloud Nextcloud 15.0.4 Talk
- Nextcloud Nextcloud 24.0.10 Server
- Nextcloud Nextcloud 25.0.4 Server
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Nextcloud Security Advisory vom 2023-04-02 github.com
- Nextcloud Security Advisory vom 2023-04-02 github.com
- PoC CVE-2023-26482 vom 2026-02-09 github.com
CVE: CVE-2023-26482, CVE-2023-28845
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.