CVE-2025-66510
4.5 · MEDIUMOverview
CVE-2025-66510 is a medium-severity vulnerability affecting nextcloud nextcloud_server. It was published on December 5, 2025 and has a CVSS 3.1 base score of 4.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from nextcloud. Update nextcloud_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nextcloud | nextcloud_server | >= 28.0.0, < 28.0.14.11 | Affected |
Frequently Asked Questions
What is CVE-2025-66510?
CVE-2025-66510 is a medium-severity vulnerability affecting nextcloud nextcloud_server. It was published on December 5, 2025 and has a CVSS 3.1 base score of 4.5 (MEDIUM).
How severe is CVE-2025-66510?
This vulnerability has a CVSS 3.1 base score of 4.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-66510?
Check the references section for vendor advisories and patches from nextcloud. Update nextcloud_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66510?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66510 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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