---
id: CVE-2025-66554
title: >-
  Contacts app for Nextcloud easily syncs contacts from various devices with
  your Nextcloud and allows editing
summary: >-
  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…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-79
vendor: nextcloud
product: contacts
affected:
  - 'contacts >= 5.0.0, < 5.5.4'
  - 'contacts >= 6.0.0, < 6.0.6'
  - 'contacts >= 7.0.0, < 7.2.5'
patched:
  - contacts 7.2.5
published: '2025-12-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:10:00.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66554'
references:
  - url: >-
      https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/contacts/pull/4619'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3293290'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.0025
epssPercentile: 0.16294
ingestedAt: '2026-10-27T18:12:09.280Z'
---

## Overview

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

- `contacts >= 5.0.0, < 5.5.4`
- `contacts >= 6.0.0, < 6.0.6`
- `contacts >= 7.0.0, < 7.2.5`

## Remediation

Upgrade past the affected range:

- `contacts 7.2.5`