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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1 Patch
- https://github.com/nextcloud/contacts/pull/4619 Issue Tracking, Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2 Patch, Vendor Advisory
- https://hackerone.com/reports/3293290 Permissions Required, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 5.4 · nextcloudNVD modified 2026-10-15 21:10
Affected (CPE criteria) 1
cpe:2.3:a:nextcloud:contacts:*:*:*:*:*:*:*:*
References 4
- https://github.com/nextcloud/contacts/commit/d954d098978dde1f121600e8b994e02f293c68b1 Patch
- https://github.com/nextcloud/contacts/pull/4619 Issue Tracking, Patch
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v78-cpfc-v6h2 Patch, Vendor Advisory
- https://hackerone.com/reports/3293290 Permissions Required, Vendor Advisory