CVE Catalog

CVE-2025-66554

LowCVSS 3.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.25%

15th percentile - higher than 15% of all known CVEs

Summary

In the Nextcloud Contacts app 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.

Risk Assessment

An attacker can inject external stylesheets, enabling manipulation of the interface appearance and potential user deception. JavaScript execution was blocked, so the risk is limited to CSS modifications.

Recommendation

Update the Nextcloud Contacts app to version 5.5.4, 6.0.6, or 7.2.5 (or later). It is also advisable to review unusual changes in users' organisation and title fields.

Related vulnerabilities

Original NVD description (English source)

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 data from NVD (NIST) · CISA KEV · EPSS