CVE-2025-64011Medium· 4.3▾ SunlitNextcloud 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 paramete…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 23.7 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Oct 14.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
0.3% → 0.3%
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.
nextcloud_server = 30.0.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-45810Medium· 6.8Nextcloud is an open source content collaboration platform
CVE-2025-66558Low· 3.1Nextcloud Twofactor WebAuthn is the WebAuthn Two-Factor Provider for Nextcloud
CVE-2025-66556Low· 3.5Nextcloud talk is a video & audio conferencing app for Nextcloud
CVE-2025-66553Medium· 4.3Nextcloud Tables allows you to create your own tables with individual columns
CVE-2025-66513Medium· 4.3Nextcloud Tables allows you to create your own tables with individual columns
CVE-2025-66551Medium· 6.3Nextcloud Tables allows you to create your own tables with individual columns