Nextcloud · Nextcloud Server · CVE-2023-25159
**Name of the Vulnerable Software and Affected Versions**
Nextcloud Server versions 24.0.x through 24.0.7
Nextcloud Server versions 25.0.x through 25.0.0
Nextcloud Enterprise Server versions 24.0.x through 24.0.7
Nextcloud Enterprise Server versions 25.0.x through 25.0.0
Nextcloud Office (Richdocuments) App versions 6.x through 6.3.0
Nextcloud Office (Richdocuments) App versions 7.x through 7.0.0
**Description**
The issue is related to incorrect access control in Nextcloud Server, allowing a remote attacker to gain unauthorized access to protected information. The problem is that previews are accessible without a watermark, and the download should be hidden with the watermark applied.
**Recommendations**
For Nextcloud Server versions 24.0.x through 24.0.7, update to version 24.0.8.
For Nextcloud Server versions 25.0.x through 25.0.0, update to version 25.0.1.
For Nextcloud Enterprise Server versions 24.0.x through 24.0.7, update to version 24.0.8.
For Nextcloud Enterprise Server versions 25.0.x through 25.0.0, update to version 25.0.1.
For Nextcloud Office (Richdocuments) App versions 6.x through 6.3.0, update to version 6.3.1.
For Nextcloud Office (Richdocuments) App versions 7.x through 7.0.0, update to version 7.0.1.