CVE-2021-40109

MEDIUM

Concrete CMS < 8.5.6 - Server-Side Request Forgery via File Upload URL Redirect

Title source: llm
STIX 2.1

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.

References (2)

Core 2
Core References
Permissions Required x_refsource_misc
https://hackerone.com/reports/1102105

Scores

CVSS v3 6.4
EPSS 0.0052
EPSS Percentile 40.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Details

CWE
CWE-918
Status published
Products (1)
concretecms/concrete_cms < 8.5.6
Published Sep 27, 2021
Tracked Since Feb 18, 2026