Nextcloud Server previews are accessible without a watermark
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform, and Nextcloud Office is a document collaboration app for the same platform. Nextcloud Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, Nextcloud Enterprise Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, and Nextcloud Office (Richdocuments) App 6.x prior to 6.3.1 and 7.x prior to 7.0.1 have previews accessible without a watermark. The download should be hidden and the watermark should get applied. This issue is fixed in Nextcloud Server 25.0.1 and 24.0.8, Nextcloud Enterprise Server 25.0.1 and 24.0.8, and Nextcloud Office (Richdocuments) App 7.0.1 (for 25) and 6.3.1 (for 24). No known workarounds are available.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| nextcloud | security-advisories | 24.0.4 to before 24.0.8; = 25.0.0; 6.0.0 to before 6.3.1; = 7.0.0 | 24.0.8, 6.3.1 | Patch available | CNA |
- security-advisories Vendornextcloud Affected 24.0.4 to before 24.0.8; = 25.0.0; 6.0.0 to before 6.3.1; = 7.0.0 Fixed in 24.0.8, 6.3.1 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | 24.0.4 – 24.0.8 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:24.0.2:-:*:*:*:*:*:* | 24.0.2 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:*:*:*:* | 25.0.0 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:* | 6.0.0 to before 6.3.1 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:richdocuments:7.0.0:-:*:*:*:*:*:* | 7.0.0 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions 24.0.4 – 24.0.8 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:24.0.2:-:*:*:*:*:*:* Versions 24.0.2 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:*:*:*:* Versions 25.0.0 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:* Versions 6.0.0 to before 6.3.1 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:richdocuments:7.0.0:-:*:*:*:*:*:* Versions 7.0.0 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 24.0.8, 6.3.1
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-25159
References
More Nextcloud Server vulnerabilities
- TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
- TI-2023-11091 Nextcloud download permissions can be changed by resharer CVSS 3.1HIGH 7.5
- TI-2023-10624 Nextcloud Server vulnerable to SSRF via filter bypass due to lax checking on IPs CVSS 3.1MEDIUM 5.3
- TI-2025-37238 Cross-site scripting in Nextcloud CVSS 3.1MEDIUM 6.4
- TI-2023-11086 nextcloud vulnerable to Uncontrolled Resource Consumption CVSS 3.1MEDIUM 6.5
- TI-2022-18738 Exception logging in Sharepoint app reveals clear-text connection details CVSS 3.1MEDIUM 6.5
Sources
- CVE-2023-25159 · CVE Program
- CVE-2023-25159 · NVD
- FIRST EPSS
- CVE-2023-25159 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences