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Contacts search allowed users to retrieve contact information of other users beyond their contact list

Moderate
nickvergessen published GHSA-495w-cqv6-wr59 Dec 5, 2025

Package

Server (Nextcloud)

Affected versions

>= 31.0.0, >= 32.0.0

Patched versions

31.0.10, 32.0.1
Server (Nextcloud Entreprise)
>= 28.0.0, >= 29.0.0, >= 30.0.0, >= 31.0.0
28.0.14.11, 29.0.16.8, 30.0.17.3, 31.0.10

Description

Impact

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.

Patches

It is recommended that the Nextcloud Server is upgraded to 31.0.10 or 32.0.1
It is recommended that the Nextcloud Enterprise Server is upgraded to 28.0.14.11, 29.0.16.8, 30.0.17.3 or 31.0.10

Workarounds

  • No workaround available

References

For more information

If you have any questions or comments about this advisory:

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N

CVE ID

CVE-2025-66510

Weaknesses

Exposure of Private Personal Information to an Unauthorized Actor

The product does not properly prevent a person's private, personal information from being accessed by actors who either (1) are not explicitly authorized to access the information or (2) do not have the implicit consent of the person about whom the information is collected. Learn more on MITRE.