CVE-2021-36582: Kooboo CMS

Critical severity, CVSS 9.8. EPSS: 1.5% chance of exploitation in the next 30 days.

In Kooboo CMS 2.1.1.0, it is possible to upload a remote shell (e.g., aspx) to the server and then call upon it to receive a reverse shell from the victim server. The files are uploaded to /Content/Template/root/reverse-shell.aspx and can be simply triggered by browsing that URL.

Affected products

• Kooboo Kooboo CMS: version 2.1.1.0 only

Published 2021-09-14. Last modified 2026-07-09.