Medium 4.9Published Dec 5, 2025

CVE-2025-66510Nextcloud Server is a self hosted personal cloud system.

Updated under an hour ago (2026-10-19 10:50 UTC)

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It affects nextcloud_server. 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_server

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: 4.9 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/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: Not given
NVD analysis: Analyzed
Record last updated: Oct 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

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

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-495w-cqv6-wr59patch, vendor-advisory
https://github.com/nextcloud/server/commit/e4866860cbf24a746eb8a125587262a4c8831c57patch
https://github.com/nextcloud/server/pull/55657issue-tracking

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.