Medium 4.5Published Dec 5, 2025

CVE-2025-66510Nextcloud Server Contacts Search allowed users to retrieve contact information of other users beyond their contact list

Updated under an hour ago (Oct 28, 2026, 2:10 AM ET)

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It affects nextcloud security-advisories and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for nextcloud security-advisories

Exploited in the last 30 days

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.

CVSS: 4.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-359
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Dec 5, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud security-advisories nextcloud:security_advisories (from the name)	from 32.0.0beta1, < 32.0.1; before 31.0.10	CNA record
nextcloud nextcloud_server nextcloud:nextcloud_server	from 28.0.0 before 28.0.14.11; from 29.0.0 before 29.0.16.8; from 30.0.0 before 30.0.17.3; from 31.0.0 before 31.0.10; from 31.0.0 before 31.0.10; from 32.0.0 before 32.0.1	NVD

References

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-495w-cqv6-wr59	x-refsource-confirm, patch, vendor-advisory
https://github.com/nextcloud/server/pull/55657	x-refsource-misc, issue-tracking
https://github.com/nextcloud/server/commit/e4866860cbf24a746eb8a125587262a4c8831c57	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.