CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCVE-2021-39222
Medium (6.1) in nextcloud talk. 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.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-79, CWE-434
- Published
- Modified
- Record from
- the NVD, synced
Affected
- nextcloud:talk
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5g
- https://github.com/nextcloud/spreed/pull/542
- https://hackerone.com/reports/1135481
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5g
- https://github.com/nextcloud/spreed/pull/542