CVE-2025-64011

Name: CVE-2025-64011
Creator: NVD / NIST
Published: 2025-12-12T17:15:45.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2025-64011 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

0.24%

14.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	30.0.0

References

https://drive.google.com/file/d/1eD3PN-u1caZYgGH96XHmJ7h_OBXEAHW4/view?usp=sharingExploit
https://gist.github.com/tarekramm/586dfe2d113fedfee6d71182570fc090Exploit, Third Party Advisory
https://nextcloud.comProduct

Timeline

Published: Dec 12, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-64011?

How severe is CVE-2025-64011?

CVE-2025-64011 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2025-64011?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-64011?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST