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CVE-2025-66510

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

Published: Dec 5, 2025Updated: Dec 10, 2025 Sources: CVE List NVD BDUCWE-359
NVD MITRE
4.5CVSSMEDIUM
EPSS Score
0.3%
Top 78.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:HUI:RS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-359

Affected Products

security-advisoriesnextcloud
SaaSSaaS Service
Cloud & SaaS / saas-application
nextcloud servernextcloud
SaaSSaaS Service
Cloud & SaaS / saas-application
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
Nextcloud ServerNextcloud GmbH
SaaSSaaS Service
Cloud & SaaS / saas-application
Nextcloud Enterprise ServerNextcloud GmbH
SaaSSaaS Service
Cloud & SaaS / saas-application
nextcloudoss-projectDECloud & SaaSaka nextcloud server
ооо «ред софт»commercialRUOperating Systemsaka red soft
nextcloud gmbhcommercialDECloud & SaaSaka nextcloud server, nextcloud enterprise server, nextcloud calendar

Exploitability

Official Patch Available

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-495w-cqv6-wr59
github.com
https://github.com/nextcloud/server/pull/55657
github.com
https://github.com/nextcloud/server/commit/e4866860cbf24a746eb8a125587262a4c8831c57
github.com
and 2 more references View all →

Timeline

Published
Dec 5, 2025
Last Updated
Dec 10, 2025

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