Nextcloud Server vulnerable to attacker enabling/disabling birthday calendar for any user
Priority LOW 21CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.
Why it matters now
EPSS 0.00604 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed security-advisories (nextcloud): 25.0.11, 26.0.6, 27.1.0 +3
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 | security-advisories | 25.0.0 to before 25.0.11; 26.0.0 to before 26.0.6; 27.0.0 to before 27.1.0; 22.0.0 to before 22.2.10.16; 23.0.0 to before 23.0.12.11; 24.0.0 to before 24.0.12.7 | 25.0.11, 26.0.6, 27.1.0, 22.2.10.16, 23.0.12.11, 24.0.12.7 | Patch available | CNA |
- security-advisories Vendornextcloud Affected 25.0.0 to before 25.0.11; 26.0.0 to before 26.0.6; 27.0.0 to before 27.1.0; 22.0.0 to before 22.2.10.16; 23.0.0 to before 23.0.12.11; 24.0.0 to before 24.0.12.7 Fixed in 25.0.11, 26.0.6, 27.1.0, 22.2.10.16, 23.0.12.11, 24.0.12.7 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 22.0.0 – 22.2.10.16; 23.0.0 to before 23.0.12.11; 24.0.0 to before 24.0.12.7 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* | 25.0.0 to before 25.0.11 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 25.0.0 to before 25.0.11 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* | 26.0.0 to before 26.0.6 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 26.0.0 to before 26.0.6 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* | 27.0.0 to before 27.1.0 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 27.0.0 to before 27.1.0 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 22.0.0 – 22.2.10.16; 23.0.0 to before 23.0.12.11; 24.0.0 to before 24.0.12.7 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 25.0.0 to before 25.0.11 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 25.0.0 to before 25.0.11 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 26.0.0 to before 26.0.6 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 26.0.0 to before 26.0.6 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 27.0.0 to before 27.1.0 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 27.0.0 to before 27.1.0 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 25.0.11, 26.0.6, 27.1.0, 22.2.10.16, 23.0.12.11, 24.0.12.7
Timeline
- 2026-10-02 Threatist record created from CVE-2023-48304
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
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences