Unrated severityOSV Advisory· Published Dec 12, 2025· Updated Dec 12, 2025
CVE-2025-64011
CVE-2025-64011
Description
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.
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Affected products
2Patches
Vulnerability mechanics
References
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