Nextcloud: Mehrere Schwachstellen
WID-SEC-2026-2685 · first 06.08.2026 · updated 06.08.2026 · 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 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
- Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Nextcloud Nextcloud server <32.0.12
- Nextcloud Nextcloud server <33.0.6
- Nextcloud Nextcloud server <34.0.1
- Nextcloud Nextcloud mail <3.7.25
- Nextcloud Nextcloud mail <5.5.16
- Nextcloud Nextcloud mail <5.6.20
- Nextcloud Nextcloud mail <5.7.13
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 32.0.12
- Nextcloud Nextcloud server 33.0.6
- Nextcloud Nextcloud server 34.0.1
- Nextcloud Nextcloud mail 3.7.25
- Nextcloud Nextcloud mail 5.5.16
- Nextcloud Nextcloud mail 5.6.20
- Nextcloud Nextcloud mail 5.7.13
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)
- GitHub Security Advisory GHSA-99gw-ww6p-f2rr vom 2026-08-05 github.com
- GitHub Security Advisory GHSA-vq3v-jv6f-6xp2 vom 2026-08-05 github.com
CVE: CVE-2026-61527, CVE-2026-61545
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.