Advanced permissions not respected when copying entire group folders
Priority LOW 30CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.
Summary
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 22.0.0 and prior to versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1, a user can access files inside a subfolder of a groupfolder accessible to them, even if advanced permissions would block access to the subfolder. Nextcloud Server versions 25.0.8, 26.0.3, and 27.0.1 and Nextcloud Enterprise Server versions 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, and 27.0.1 contain a patch for this issue. No known workarounds are available.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00809 57th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 22.2.10.13, 23.0.12.8, 24.0.12.4 +3
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 | 22.0.0 to before 22.2.10.13; 23.0.0 to before 23.0.12.8; 24.0.0 to before 24.0.12.4; 25.0.0 to before 25.0.8; 26.0.0 to before 26.0.3; 27.0.0 to before 27.0.1 | 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, 27.0.1 | Patch available | CNA |
- security-advisories Vendornextcloud Affected 22.0.0 to before 22.2.10.13; 23.0.0 to before 23.0.12.8; 24.0.0 to before 24.0.12.4; 25.0.0 to before 25.0.8; 26.0.0 to before 26.0.3; 27.0.0 to before 27.0.1 Fixed in 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, 27.0.1 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 22.0.0 to before 22.2.10.13; 23.0.0 to before 23.0.12.8; 24.0.0 to before 24.0.12.4 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* | 25.0.0 to before 25.0.8 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 25.0.0 to before 25.0.8 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* | 26.0.0 to before 26.0.3 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 26.0.0 to before 26.0.3 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:27.0.0:*:*:*:-:*:*:* | 27.0.0 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:27.0.0:*:*:*:enterprise:*:*:* | 27.0.0 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 22.0.0 to before 22.2.10.13; 23.0.0 to before 23.0.12.8; 24.0.0 to before 24.0.12.4 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 25.0.0 to before 25.0.8 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 25.0.0 to before 25.0.8 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 26.0.0 to before 26.0.3 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 26.0.0 to before 26.0.3 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:27.0.0:*:*:*:-:*:*:* Versions 27.0.0 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:27.0.0:*:*:*:enterprise:*:*:* Versions 27.0.0 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 22.2.10.13, 23.0.12.8, 24.0.12.4, 25.0.8, 26.0.3, 27.0.1
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-39952
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-2023-39952 · CVE Program
- CVE-2023-39952 · NVD
- FIRST EPSS
- CVE-2023-39952 · 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