Vulnerability Description
Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 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 Contacts application is upgraded to 4.0.3. As a workaround, one may use a browser that has support for Content-Security-Policy.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Contacts | < 4.0.3 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/contacts/pull/2407Third Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j6cx-mThird Party Advisory
- https://github.com/nextcloud/contacts/pull/2407Third Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-j6cx-mThird Party Advisory
FAQ
What is CVE-2021-39221?
CVE-2021-39221 is a vulnerability with a CVSS score of 6.4 (MEDIUM). Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Contacts application prior to version 4.0.3 was vulnerable to a stored Cross-Site Scripting (XSS) vulnerability. For explo...
How severe is CVE-2021-39221?
CVE-2021-39221 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-2021-39221?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Contacts.