CVE-2025-66510 - CVE House
Back to Database
Status published Medium CVE-2025-66510

Nextcloud Server Contacts Search allowed users to retrieve contact information of other users beyond their contact list

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-66510

Credits & Attribution

No credits recorded in the NVD database.

References

More from nextcloud

View All →
CVE-2025-66558
Nextcloud Twofactor WebAuthn app was updated based on public key
Low 3.1
CVE-2025-66557
Nextcloud Deck app allowed user with "Can share" permission to modify permissions of other non-owners
Medium 5.4
CVE-2025-66556
Nextcloud talk allows participants to blindly delete poll drafts of other users by ID
Low 3.5
CVE-2025-66554
Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title field
Low 3.5
CVE-2025-66553
Nextcloud Tables app allowed users to view columns metadata information of any table
Medium 4.3

Affected Vendor

Affected Software

security-advisories
Vulnerable Versions:
>= 32.0.0beta1, < 32.0.1, < 31.0.10

Timeline

Official Publish: December 5th, 2025
Last Modified: December 5th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-359

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.