Is CVE-2025-66552 in the CISA KEV catalog?

No. CVE-2025-66552 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66552?

CVE-2025-66552 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2025-66552?

CVE-2025-66552 has an EPSS score of 0.27% (18th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66552?

Upgrade nextcloud server to 31.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2025-66552

MEDIUM

4.3

CVSS v3

NVD

Description

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1, incorrect path handling with groupfolders caused the admin_audit app to not properly log all actions on files and folders inside groupfolders. This vulnerability is fixed in Nextcloud Server and Enterprise Server prior to 30.0.9 and 31.0.1.

CWE-778

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 31.0.0, < 31.0.1Fixed in:31.0.1CVE-2025-66552derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

18thpercentile

Low risk: more likely to be exploited than 18% of all known CVEs.

References

Patch2

Vendor Advisory1

hackerone.com

Issue Tracking1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-10.