CVE-2020-8280: Nextcloud Contacts

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A missing file type check in Nextcloud Contacts 3.4.0 allows a malicious user to upload SVG files as PNG files to perform cross-site scripting (XSS) attacks.

Affected products

• Nextcloud Contacts: before 3.4.1 (fixed in 3.4.1)

Published 2021-01-06. Last modified 2026-06-17.