Description
Nextcloud Desktop Client before 3.3.1 is vulnerable to improper certificate validation due to lack of SSL certificate verification when using the "Register with a Provider" flow.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Nextcloud Desktop Client | Fixed in 3.3.1 | — |
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 | 3.3.1-1 | — |
| Debian 13 | nextcloud-desktop | 3.3.1-1 | — |
| Debian 12 | nextcloud-desktop | 3.3.1-1 | — |
| Debian 11 | nextcloud-desktop | 3.1.1-2+deb11u1 | DSA-4974-1 |
| Debian 10 | nextcloud-desktop | 2.5.1-3+deb10u2 | DSA-4974-1 |
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 | — |
Advisories 1
- DSA-4974-1 nextcloud-desktop - security update Debian Security (DSA / DLA) · Mar 9, 2026