Nextcloud: Schwachstelle ermöglicht Codeausführung
WID-SEC-2026-3439 · first 17.09.2026 · updated 17.09.2026 · CVSS 7,4
What it is about
Nextcloud ist eine "on-premise" Plattform für Dateifreigabe und Zusammenarbeit. Ein Angreifer kann eine Schwachstelle in Nextcloud ausnutzen, um beliebigen Programmcode auszuführen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen
Am I affected?
Affected according to the BSI:
- Nextcloud Nextcloud <22.2.10.42
- Nextcloud Nextcloud <23.0.12.38
- Nextcloud Nextcloud <24.0.13.37
- Nextcloud Nextcloud <25.0.13.32
- Nextcloud Nextcloud <26.0.13.29
- Nextcloud Nextcloud <27.1.11.29
- Nextcloud Nextcloud <28.0.14.20
- Nextcloud Nextcloud <29.0.16.19
- Nextcloud Nextcloud <30.0.17.12
- Nextcloud Nextcloud <31.0.14.8
- Nextcloud Nextcloud <32.0.13
- Nextcloud Nextcloud <33.0.7
and 1 more
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Nextcloud Nextcloud 22.2.10.42
- Nextcloud Nextcloud 23.0.12.38
- Nextcloud Nextcloud 24.0.13.37
- Nextcloud Nextcloud 25.0.13.32
- Nextcloud Nextcloud 26.0.13.29
- Nextcloud Nextcloud 27.1.11.29
- Nextcloud Nextcloud 28.0.14.20
- Nextcloud Nextcloud 29.0.16.19
- Nextcloud Nextcloud 30.0.17.12
- Nextcloud Nextcloud 31.0.14.8
- Nextcloud Nextcloud 32.0.13
- Nextcloud Nextcloud 33.0.7
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
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.