Nextcloud Server 30.0.0 is vulnerable to an Insecure Direct Object Reference (IDOR) in the /core/preview endpoint. Any authenticated user can access previews of arbitrary files belonging to other users by manipulating the fileId parameter. This allows unauthorized disclosure of sensitive data, such as text files or images, without prior sharing permissions.
References
| Link | Resource |
|---|---|
| https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharing | Exploit |
| https://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090 | Exploit Third Party Advisory |
| https://nextcloud.com | Product |
Configurations
History
19 Dec 2025, 15:47
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Nextcloud
Nextcloud nextcloud Server |
|
| References | () https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharing - Exploit | |
| References | () https://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090 - Exploit, Third Party Advisory | |
| References | () https://nextcloud.com - Product | |
| CPE | cpe:2.3:a:nextcloud:nextcloud_server:30.0.0:-:*:*:*:*:*:* |
12 Dec 2025, 19:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.3 |
| CWE | CWE-639 |
12 Dec 2025, 17:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-12-12 17:15
Updated : 2025-12-19 15:47
NVD link : CVE-2025-64011
Mitre link : CVE-2025-64011
CVE.ORG link : CVE-2025-64011
JSON object : View
Products Affected
nextcloud
- nextcloud_server
CWE
CWE-639
Authorization Bypass Through User-Controlled Key