Vulnerability Description
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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Contacts | >= 5.0.0, < 5.5.4 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293Patch
- https://github.com/nextcloud/contacts/pull/4619Issue TrackingPatch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cPatchVendor Advisory
- https://hackerone.com/reports/3293290Permissions RequiredVendor Advisory
FAQ
What is CVE-2025-66554?
CVE-2025-66554 is a vulnerability with a CVSS score of 3.5 (LOW). 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 a...
How severe is CVE-2025-66554?
CVE-2025-66554 has been rated LOW with a CVSS base score of 3.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-66554?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Contacts.