Nextcloud download permissions can be changed by resharer
Priority HIGH 66CWE-284Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- 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 · NVD. Fix status from CNA. Impact type from CWE-284.
Summary
Nextcloud is an Open Source private cloud software. Versions 24.0.4 and above, prior to 24.0.7, and 25.0.0 and above, prior to 25.0.1, contain Improper Access Control. Secure view for internal shares can be circumvented if reshare permissions are also given. This issue is patched in versions 24.0.7 and 25.0.1. No workaround is available.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00946 61st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed security-advisories (nextcloud): 24.0.7, 25.0.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- 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 24.0.7; 25.0.0 to before 25.0.1 | 24.0.7, 25.0.1 | Patch available | CNA |
- security-advisories Vendornextcloud Affected 24.0.4 to before 24.0.7; 25.0.0 to before 25.0.1 Fixed in 24.0.7, 25.0.1 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* | 24.0.4 to before 24.0.7 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* | 24.0.4 to before 24.0.7 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:*:*:*:* | 25.0.0 | Vulnerable | nextcloud |
| cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:enterprise:*:*:* | 25.0.0 | Vulnerable | nextcloud |
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:* Versions 24.0.4 to before 24.0.7 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 24.0.4 to before 24.0.7 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:*:*:*:* Versions 25.0.0 Vulnerable ·nextcloud
- cpe:2.3:a:nextcloud:nextcloud_server:25.0.0:*:*:*:enterprise:*:*:* Versions 25.0.0 Vulnerable ·nextcloud
Remediation
- Fix · CNA security-advisories (nextcloud) Fixed in 24.0.7, 25.0.1
Timeline
- 2026-10-02 Threatist record created from CVE-2023-25821
References
More Nextcloud Server vulnerabilities
- TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
- 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
- TI-2022-08555 High memory usage in Nextcloud server CVSS 3.1MEDIUM 6.5
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences