Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Talk | < 10.0.7 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-fThird Party Advisory
- https://github.com/nextcloud/spreed/pull/542Third Party Advisory
- https://hackerone.com/reports/1135481Permissions RequiredThird Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-fThird Party Advisory
- https://github.com/nextcloud/spreed/pull/542Third Party Advisory
- https://hackerone.com/reports/1135481Permissions RequiredThird Party Advisory
FAQ
What is CVE-2021-39222?
CVE-2021-39222 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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 ...
How severe is CVE-2021-39222?
CVE-2021-39222 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-39222?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Talk.