Medium severity4.3OSV Advisory· Published Dec 12, 2025· Updated Jun 17, 2026
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4- Range: = 30.0.0
Patches
Vulnerability mechanics
References
3- drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/viewnvdExploit
- gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090nvdExploitThird Party Advisory
- nextcloud.comnvdProduct
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