Description
Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure and add new files. This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nextcloud | security-advisories | >= 3.0.0, < 3.8.0, >= 3.13.0, < 3.25.0, >= 3.0.5, < 4.8.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nextcloud-desktop | 3.9.0-1 | — |
| Debian 13 | nextcloud-desktop | 3.9.0-1 | — |
| Debian 12 | nextcloud-desktop | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nextcloud-desktop | No fix yet | — |
| Ubuntu 26.04 LTS | nextcloud-desktop | No fix yet | — |
| Ubuntu 25.10 | nextcloud-desktop | No fix yet | — |
| Ubuntu 24.04 LTS | nextcloud-desktop | No fix yet | — |
| Ubuntu 22.04 LTS | nextcloud-desktop | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | nextcloud-desktop | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nextcloud-client | 3.8.1-r0 | — |
| Alpine v3.23 | nextcloud-client | 3.8.1-r0 | — |
| Alpine v3.22 | nextcloud-client | 3.8.1-r0 | — |
| Alpine v3.21 | nextcloud-client | 3.8.1-r0 | — |
| Alpine v3.20 | nextcloud-client | 3.8.1-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nextcloud-client | 3.8.1-r0 | — |
| Alpine v3.18 | nextcloud-client | 3.8.1-r0 | — |
Advisories 1
- WID-SEC-2023-0847 Nextcloud: Mehrere Schwachstellen ermöglichen Manipulation von Dateien BSI CERT-Bund (WID) · Sep 17, 2025