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CVE-2021-39222

Nextcloud is an open-source, self-hosted productivity platform.

Impact

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

VendorProductAffected versions
NextcloudTalk
before 10.0.7
from 10.1.0 before 10.1.4
from 11.0.0 before 11.1.2

Weakness classification

CWE-79CWE-434

References