Nextcloud Contacts App XSS via Org/Title CSS Injection <5.5.4/6.0.6/7.2.5
CVE-2025-66554 Published on December 5, 2025
Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title field
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.
Vulnerability Analysis
CVE-2025-66554 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2025-66554 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2025-66554
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Affected Versions
nextcloud security-advisories:- Version >= 7.0.0-alpha.1, < 7.2.5 is affected.
- Version >= 6.0.0-alpha1, < 6.0.6 is affected.
- Version < 5.5.4 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.