Description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nextcloud | security-advisories | >= 3.0.0, < 3.6.5 | — |
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 | 3.7.0-1 | — |
| Debian 13 | nextcloud-desktop | 3.7.0-1 | — |
| Debian 12 | nextcloud-desktop | 3.7.0-1 | — |
| Debian 11 | nextcloud-desktop | 3.1.1-2+deb11u2 | DLA-4303-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | nextcloud-desktop | No fix yet | — |
| Ubuntu 20.04 LTS | nextcloud-desktop | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | nextcloud-client | 3.6.6-r0 | — |
| Alpine v3.23 | nextcloud-client | 3.6.6-r0 | — |
| Alpine v3.22 | nextcloud-client | 3.6.6-r0 | — |
| Alpine v3.21 | nextcloud-client | 3.6.6-r0 | — |
| Alpine v3.20 | nextcloud-client | 3.6.6-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | nextcloud-client | 3.6.6-r0 | — |
| Alpine v3.18 | nextcloud-client | 3.6.6-r0 | — |
Advisories 2
- DLA-4303-1 nextcloud-desktop - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2023-0847 Nextcloud: Mehrere Schwachstellen ermöglichen Manipulation von Dateien BSI CERT-Bund (WID) · Sep 17, 2025