Improper access control in Nextcloud Server
Priority LOW 37CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
Improper revalidation of permissions in Nextcloud Server prior to 14.0.0, 13.0.6 and 12.0.11 lead to not accepting access restrictions by acess tokens.
Why it matters now
EPSS 0.00957 61st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Nextcloud Server | <14.0.0, <13.0.6, <12.0.11 | — | No fix listed | CNA |
- Nextcloud Server Vendor— Affected <14.0.0, <13.0.6, <12.0.11 Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | before 12.0.11; 13.0.0 to before 13.0.6 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta1:*:*:*:*:*:* | 14.0.0 beta1 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta2:*:*:*:*:*:* | 14.0.0 beta2 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta3:*:*:*:*:*:* | 14.0.0 beta3 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta4:*:*:*:*:*:* | 14.0.0 beta4 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:rc1:*:*:*:*:*:* | 14.0.0 rc1 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:rc2:*:*:*:*:*:* | 14.0.0 rc2 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions before 12.0.11; 13.0.0 to before 13.0.6 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta1:*:*:*:*:*:* Versions 14.0.0 beta1 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta2:*:*:*:*:*:* Versions 14.0.0 beta2 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta3:*:*:*:*:*:* Versions 14.0.0 beta3 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:beta4:*:*:*:*:*:* Versions 14.0.0 beta4 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:rc1:*:*:*:*:*:* Versions 14.0.0 rc1 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:14.0.0:rc2:*:*:*:*:*:* Versions 14.0.0 rc2 Vulnerable ·nextcloud
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2018-16466
- 2026-10-03 Alias added: GHSA-6mm6-pp6h-9p36
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-2018-16466 · CVE Program
- CVE-2018-16466 · NVD
- FIRST EPSS
- GHSA-6mm6-pp6h-9p36 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-16466 · 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