Description
Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nextcloud | security-advisories | < 19.0.13, >= 20.0.0, < 20.0.11, >= 21.0.0, < 21.0.3 | — |
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.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP3 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
| SUSE Package Hub 15 SP2 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
| SUSE Package Hub 15 SP1 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
| openSUSE Leap 15.2 | nextcloud | 20.0.11-bp153.2.3.1 | openSUSE-SU-2021:1068-1 |
Advisories 1
- openSUSE-SU-2021:1068-1 Security update for nextcloud SUSE / openSUSE Security Updates · Feb 4, 2026