Nextcloud: Mehrere Schwachstellen
WID-SEC-2026-1773 · first 02.06.2026 · updated 02.06.2026 · CVSS 7,1
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 Sicherheitsvorkehrungen zu umgehen, einen Denial of Service zu verursachen und 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
- Sicherheitsvorkehrungen zu umgehen
- einen Denial of Service zu verursachen
- Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Nextcloud Nextcloud Server <33.0.3
- Nextcloud Nextcloud Server <32.0.9
- Nextcloud Nextcloud Enterprise Server <33.0.3
- Nextcloud Nextcloud Enterprise Server <32.0.9
- Nextcloud Nextcloud Enterprise Server <31.0.14.5
- Nextcloud Nextcloud Enterprise Server <30.0.17.9
- Nextcloud Nextcloud Enterprise Server <29.0.16.16
- Nextcloud Nextcloud Tables <0.9.7
- Nextcloud Nextcloud Tables <1.0.2
- Nextcloud Nextcloud Server <31.0.12
- Nextcloud Nextcloud Server <32.0.3
- Nextcloud Nextcloud Enterprise Server <21.0.9.20
and 11 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 Server 33.0.3
- Nextcloud Nextcloud Server 32.0.9
- Nextcloud Nextcloud Enterprise Server 33.0.3
- Nextcloud Nextcloud Enterprise Server 32.0.9
- Nextcloud Nextcloud Enterprise Server 31.0.14.5
- Nextcloud Nextcloud Enterprise Server 30.0.17.9
- Nextcloud Nextcloud Enterprise Server 29.0.16.16
- Nextcloud Nextcloud Tables 0.9.7
- Nextcloud Nextcloud Tables 1.0.2
- Nextcloud Nextcloud Server 31.0.12
- Nextcloud Nextcloud Server 32.0.3
- Nextcloud Nextcloud Enterprise Server 21.0.9.20
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 2026-06-01 github.com
- Nextcloud Security Advisory vom 2026-06-01 github.com
- Nextcloud Security Advisory vom 2026-06-01 github.com
CVE: CVE-2026-45690, CVE-2026-45722, CVE-2026-45810
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.