CVE-2025-66554
Low
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.
SeverityLow
CVSS3.5
Exploit probability—
Product
Nextcloud Contacts
PublishedDec 5, 2025
First seenDec 5, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- nextcloud contacts5.5.4, 6.0.6, 7.2.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nextcloud contacts | 5.0.0 ≤ v < 5.5.4, 6.0.0 ≤ v < 6.0.6, 7.0.0 ≤ v < 7.2.5 | 5.5.4, 6.0.6, 7.2.5 |
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