Vulnerability Database

314,496

Total vulnerabilities in the database

CVE-2021-39221

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.

  • Published: Oct 25, 2021
  • Updated: Nov 16, 2025
  • CVE: CVE-2021-39221
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.4
  • AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

CVSS v2:

  • Severity: Low
  • Score: 3.5
  • AV:N/AC:M/Au:S/C:N/I:P/A:N

CWEs:

OWASP TOP 10:

Software From Fixed in
nextcloud / contacts - 4.0.3