CVE-2021-22878: Fedoraproject Fedora

Medium severity, CVSS 4.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Nextcloud Server prior to 20.0.6 is vulnerable to reflected cross-site scripting (XSS) due to lack of sanitization in `OC.Notification.show`.

Affected products

• Fedoraproject Fedora: version 34 only
• Nextcloud Nextcloud Server: before 20.0.6 (fixed in 20.0.6)

Published 2021-03-03. Last modified 2026-06-17.