Vulnerability · Published Nov 15, 2021 · Assigned by GitHub_M
CVE-2021-39222XSS in Talk
Medium 6.4
In plain English
A medium-severity unrestricted file upload in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | < 10.0.7>= 10.1.0, < 10.1.4>= 11.1.0, < 11.1.2< 11.2.0>= 12.0.0.alpha-1, < 12.0.0 |
Weakness: CWE-434, CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xhxq-f4vg-jw5g x_refsource_CONFIRM
- https://github.com/nextcloud/spreed/pull/542 x_refsource_MISC
- https://hackerone.com/reports/1135481 x_refsource_MISC