Is CVE-2025-66510 in the CISA KEV catalog?

No. CVE-2025-66510 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66510?

CVE-2025-66510 has a CVSS v3 base score of 4.5 (MEDIUM).

What is the EPSS score for CVE-2025-66510?

CVE-2025-66510 has an EPSS score of 0.30% (21th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66510?

Upgrade nextcloud server to 31.0.10 or later.

CVE & CISA-KEV Catalog

CVE-2025-66510

MEDIUM

4.5

CVSS v3

NVD

Description

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server prior to 31.0.10 and 32.0.1 and Nextcloud Enterprise Server prior to 28.0.14.11, 29.0.16.8, 30.0.17.3, and 31.0.10, contacts search allowed to retrieve personal data of other users (emails, names, identifiers) without proper access control. This allows an authenticated user to retrieve information about accounts that are not related or added as contacts.

CWE-359

How to fix

Remediation Available

nextcloud serverNVD

Affected:>= 31.0.0, < 31.0.10Fixed in:31.0.10CVE-2025-66510derived from NVD

Affected:>= 32.0.0, < 32.0.1Fixed in:32.0.1CVE-2025-66510derived 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 RequiredHigh

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.30%probability of exploitation in 30 days

21stpercentile

Low risk: more likely to be exploited than 21% of all known CVEs.

References

Patch2

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.