VULNERABILITY INTELLIGENCE

CVE-2021-40109

CVSS score6.4 MEDIUM
EPSS probability0.54%
CISA KEVNot currently listed
Published2021-09-27
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Description

A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.

Weakness classification

  • CWE-918: Server-Side Request Forgery (SSRF)

Primary references