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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.

PUBLISHED Reserved 2025-10-27 | Published 2025-12-12 | Updated 2025-12-12 | Assigner mitre

References

drive.google.com/...aZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharing

nextcloud.com

gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090

cve.org (CVE-2025-64011)

nvd.nist.gov (CVE-2025-64011)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.