Medium 5.4Published Dec 5, 2025

CVE-2025-66554Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing.

Updated under an hour ago (2026-10-19 06:50 UTC)

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It affects nextcloud contacts. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for nextcloud contacts

Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud contacts nextcloud:contacts	from 5.0.0 before 5.5.4; from 6.0.0 before 6.0.6; from 7.0.0 before 7.2.5	NVD

References

https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1patch
https://github.com/nextcloud/contacts/pull/4619issue-tracking, patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2patch, vendor-advisory
https://hackerone.com/reports/3293290permissions-required, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.