CVE-2021-39222: Nextcloud Talk

Medium severity, CVSS 6.1. EPSS: 1.1% chance of exploitation in the next 30 days.

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Talk application was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For exploitation, a user would need to right-click on a malicious file and open the file in a new tab. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. It is recommended that the Nextcloud Talk application is upgraded to patched versions 10.0.7, 10.1.4, 11.1.2, 11.2.0 or 12.0.0. As a workaround, use a browser that has support for Content-Security-Policy.

Affected products

• Nextcloud Talk: before 10.0.7 (fixed in 10.0.7); from 10.1.0, before 10.1.4 (fixed in 10.1.4); from 11.0.0, before 11.1.2 (fixed in 11.1.2)

Published 2021-11-15. Last modified 2026-06-17.