Vulnerability Description
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Server | >= 20.0.3, < 20.0.13 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vThird Party Advisory
- https://github.com/nextcloud/server/pull/28726PatchThird Party Advisory
- https://hackerone.com/reports/1302155Permissions Required
- https://security.gentoo.org/glsa/202208-17Third Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vThird Party Advisory
- https://github.com/nextcloud/server/pull/28726PatchThird Party Advisory
- https://hackerone.com/reports/1302155Permissions Required
- https://security.gentoo.org/glsa/202208-17Third Party Advisory
FAQ
What is CVE-2021-41178?
CVE-2021-41178 is a vulnerability with a CVSS score of 8.8 (HIGH). Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images fr...
How severe is CVE-2021-41178?
CVE-2021-41178 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-41178?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Server.