Vulnerability Description
Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text application shipped with Nextcloud server used a `text/html` Content-Type when serving files to users. Due the strict Content-Security-Policy shipped with Nextcloud, this issue is not exploitable on modern browsers supporting Content-Security-Policy. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. As a workaround, use a browser that has support for Content-Security-Policy.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 19.0.13 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x4w3-jThird Party Advisory
- https://github.com/nextcloud/text/pull/1689PatchThird Party Advisory
- https://hackerone.com/reports/1241460Permissions Required
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-x4w3-jThird Party Advisory
- https://github.com/nextcloud/text/pull/1689PatchThird Party Advisory
- https://hackerone.com/reports/1241460Permissions Required
FAQ
What is CVE-2021-32733?
CVE-2021-32733 is a vulnerability with a CVSS score of 4.8 (MEDIUM). Nextcloud Text is a collaborative document editing application that uses Markdown. A cross-site scripting vulnerability is present in versions prior to 19.0.13, 20.0.11, and 21.0.3. The Nextcloud Text...
How severe is CVE-2021-32733?
CVE-2021-32733 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32733?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Nextcloud Server.