CVE-2025-66554
December 05, 2025
Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. Prior to 5.5.4, 6.0.6, and 7.2.5, a malicious user was able to modify their organisation and title field to load additional CSS files. Javascript and other options were correctly blocked by the content security policy of the Nextcloud Server code. This vulnerability is fixed in 5.5.4, 6.0.6, and 7.2.5.
Affected Packages
https://github.com/nextcloud/contacts.git (GITHUB):
Affected version(s) >=v2.0.1 <v5.5.4Fix Suggestion:
Update to version v5.5.4https://github.com/nextcloud/contacts.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.0.6Fix Suggestion:
Update to version v6.0.6https://github.com/nextcloud/contacts.git (GITHUB):
Affected version(s) >=v7.0.0 <v7.2.5Fix Suggestion:
Update to version v7.2.5Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.02
