Nextcloud: Mehrere Schwachstellen
WID-SEC-2026-1471 · first 12.05.2026 · updated 02.06.2026 · CVSS 8,1
What it is about
Nextcloud ist eine "on-premise" Plattform für Dateifreigabe und Zusammenarbeit. Ein Angreifer kann mehrere Schwachstellen im Nextcloud Server und verschiedenen Apps ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Informationen offenzulegen, und um Dateien zu manipulieren.
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
- Sicherheitsvorkehrungen zu umgehen
- Informationen offenzulegen
- Dateien zu manipulieren
Am I affected?
Affected according to the BSI:
- Nextcloud Nextcloud Android Files <33.1.0
- Nextcloud Nextcloud Server <32.0.9
- Nextcloud Nextcloud Server <33.0.3
- Nextcloud Nextcloud User OIDC <8.4.0
- Nextcloud Nextcloud Collectives <4.3.0
- Nextcloud Nextcloud End-to-End Encryption <1.15.4
- Nextcloud Nextcloud End-to-End Encryption <1.16.3
- Nextcloud Nextcloud End-to-End Encryption <1.17.1
- Nextcloud Nextcloud End-to-End Encryption <1.18.1
- Nextcloud Nextcloud End-to-End Encryption <2.0.0-rc.7
- Nextcloud Nextcloud Calendar <6.2.3
- Nextcloud Nextcloud Calendar <5.5.17
and 10 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 Android Files 33.1.0
- Nextcloud Nextcloud Server 32.0.9
- Nextcloud Nextcloud Server 33.0.3
- Nextcloud Nextcloud User OIDC 8.4.0
- Nextcloud Nextcloud Collectives 4.3.0
- Nextcloud Nextcloud End-to-End Encryption 1.15.4
- Nextcloud Nextcloud End-to-End Encryption 1.16.3
- Nextcloud Nextcloud End-to-End Encryption 1.17.1
- Nextcloud Nextcloud End-to-End Encryption 1.18.1
- Nextcloud Nextcloud End-to-End Encryption 2.0.0-rc.7
- Nextcloud Nextcloud Calendar 6.2.3
- Nextcloud Nextcloud Calendar 5.5.17
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-2w7v-5299-3hw5 vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-35fx-69q6-xpjr vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-45pj-p7x7-4mhc vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-4chh-6mhf-p4jj vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-79xf-ffj8-96fm vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-8mpv-ggq8-hf3w vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-hrrv-mp25-26vv vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-p3qw-7gwx-wg24 vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-qqgv-fqwp-mjpp vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-r3xh-x86g-hw4m vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-r697-74m9-gvf2 vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-xpgv-grf9-gm7x vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-8wjr-5cg8-4w73 vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-h7gm-vgxr-9hcw vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-j33j-qph5-4wch vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-r4gh-f8x6-m55f vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-v8q8-w6c3-3gv9 vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-wx2x-822r-rvmf vom 2026-05-11 github.com
- GitHub Security Advisory GHSA-x75r-65hm-cw35 vom 2026-05-11 github.com
CVE: CVE-2026-45153, CVE-2026-45154, CVE-2026-45155, CVE-2026-45156, CVE-2026-45157, CVE-2026-45159, CVE-2026-45264, CVE-2026-45266, CVE-2026-45267, CVE-2026-45275, CVE-2026-45277, CVE-2026-45278, CVE-2026-45279, CVE-2026-45281, CVE-2026-45282, CVE-2026-45283, CVE-2026-45284, CVE-2026-45285, CVE-2026-45286
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.