CVE-2025-66554

Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title field

Published Dec 5, 2025 CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:nextcloud:contacts:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud contacts
Vendors & Products Nextcloud
Nextcloud contacts
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Nextcloud Contacts vulnerable to Stored XSS in contacts app via organisation and title field
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 8, 2025, 7:51 PM
Reserved
Dec 4, 2025, 3:57 PM
Status
Analyzed
Published
Dec 5, 2025, 6:15 PM
Modified
Oct 15, 2026, 9:10 PM