Vulnerability Report

CVE-2025-64011

Title: IDOR in /core/preview endpoint

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2025-64011.

CWE Category CWE-639

Published Date Dec 12, 2025

Modified Date Oct 14, 2026

Exploit Status Not Found

Score 4.3 CVSS v3.1

Exploit Probability (EPSS)

0.27%

Vulnerability Summary

CVE-2025-64011: 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.

Impacted Vendors

nextcloud 1

Reference Links

https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharing https://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090 https://nextcloud.com

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity MEDIUM

4.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-64011 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

October 14, 2026 MODIFIED

Vulnerability data updated via NVD.

December 19, 2025 MODIFIED

Vulnerability data or affected products updated.

December 19, 2025 MODIFIED

Vulnerability data updated via NVD.

December 12, 2025 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected Stack

No specific products linked.