CVE-2025-64011

PoC ×2—

CVSS 3.1

4.3 medium

EPSS

<1%p20

Published

Dec 12, 2025 (Dec 12, 2025)

Modified

Jun 17, 2026

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.

Vendors: nextcloud
Products: nextcloud server
Weakness: CWE-639
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.3%)

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