CVE-2020-8294: Nextcloud Server

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.

Affected products

• Nextcloud Nextcloud Server: before 18.0.11 (fixed in 18.0.11); from 19.0.0, before 19.0.5 (fixed in 19.0.5); from 20.0.0, before 20.0.2 (fixed in 20.0.2)

Published 2021-02-03. Last modified 2026-06-17.