CVE-2021-40109

MEDIUM
6.4
CVSS Score
Published: September 27, 2021 at 12:04 PM UTC
Updated: June 17, 2026 at 04:06 AM UTC
1 product affected across 1 vendorConcrete CMS

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Severity
MEDIUM6.4
Exploit prediction
EPSS 0.5%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 8.5.6
Affected range stops below 8.5.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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