CVE-2025-64011

Medium · 4.3

CVSS

4.3

EPSS

0.3%

Published

Dec 12, 2025

CISA due date

—

The record

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.

Affected packages

Ecosystem	Package	Introduced	Fixed