Low 3.5Published Dec 5, 2025

CVE-2025-66554Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title field

Updated under an hour ago (Oct 26, 2026, 2:20 AM ET)

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It affects nextcloud security-advisories and 1 other product. 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 security-advisories

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: 3.5 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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: GitHub_M
NVD analysis: Analyzed
Record last updated: Dec 8, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nextcloud security-advisories nextcloud:security_advisories (from the name)	from 7.0.0-alpha.1, < 7.2.5; from 6.0.0-alpha1, < 6.0.6; before 5.5.4	CNA record
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/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2x-refsource-confirm, patch, vendor-advisory
https://github.com/nextcloud/contacts/pull/4619x-refsource-misc, issue-tracking, patch
https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1x-refsource-misc, patch
https://hackerone.com/reports/3293290x-refsource-misc, permissions-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.