4.3

CVE-2025-64011: nextcloud nextcloud_server

CVSS: 4.3v3.1MediumAnalyzed
Published 12-12-2025Last modified 12-12-2025
Open JSON

Vulnerability summary

CVE-2025-64011 is a medium (CVSS 4.3) vulnerability in nextcloud nextcloud_server. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.7% of scored vulnerabilities. 2 public exploits are recorded.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2github, reference

Timeline

  1. 12-12-2025
    PublishedVulnerability first disclosed.
  2. 12-12-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

0.00 pp

From 0.27% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.27%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

2 found
  • githubUnverified

    586Dfe2D113Fedfee6D71182570Fc090

    Maturity: poc

  • referenceUnverified

    Exploit Reference (drive.google.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Nextcloud1 product

1 vendor · 1 product

References

3 links