CVE-2023-33182: Nextcloud Contacts

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. The unsanitized SVG is converted to a JavaScript blob (in memory data) that the Avatar can't render. Due to this constellation the missing sanitization does not seem to be exploitable. It is recommended that the Contacts app is upgraded to 5.0.3 or 4.2.4

Affected products

• Nextcloud Contacts: from 4.1.0, before 4.2.4 (fixed in 4.2.4); from 5.0.0, before 5.0.3 (fixed in 5.0.3)

Published 2023-05-30. Last modified 2026-06-17.