CVE-2025-66510

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.

CVSS v3.1 Score

4.5

MEDIUM

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

Weakness Type (CWE)

CWE-359 CWE-359

Affected Products

Vendor	Product	Versions
nextcloud	nextcloud_server	28.0.0 — 28.0.14.11
nextcloud	nextcloud_server	29.0.0 — 29.0.16.8
nextcloud	nextcloud_server	30.0.0 — 30.0.17.3
nextcloud	nextcloud_server	31.0.0 — 31.0.10
nextcloud	nextcloud_server	31.0.0 — 31.0.10
nextcloud	nextcloud_server	32.0.0 — 32.0.1

References

Advisories & Patches

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-495w-cqv6-wr59 https://github.com/nextcloud/server/commit/e4866860cbf24a746eb8a125587262a4c8831c57

Other References

https://github.com/nextcloud/server/pull/55657

Frequently Asked Questions

What is CVE-2025-66510? +

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. It has a CVSS v3.1 base score of 4.5 (MEDIUM).

How severe is CVE-2025-66510? +

CVE-2025-66510 has a CVSS v3.1 score of 4.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-66510? +

CVE-2025-66510 affects products from nextcloud, specifically: nextcloud_server. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66510? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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