Unauthorized File Upload Vulnerability in Concrete CMS by Concrete5
CVE-2026-68533

2.3LOW

Key Information:

Vendor

Concrete Cms

Status
Concrete Cms
Vendor
CVE Published:
15 September 2026

What is CVE-2026-68533?

A vulnerability exists in Concrete CMS versions prior to 9.5.3, where the conversation attachment upload functionality allows users to import files into the file manager without proper permission checks. The system evaluates the 'Add Message Attachments' permission only after the file has been uploaded, potentially allowing unauthorized users or unauthenticated visitors to import files of approved types. This flaw could lead to file management issues and expose the system to various security risks.

Affected Version(s)

Concrete CMS 5.0.0 <= 9.5.2

References

https://documentation.concretecms.org/developers/introduc...
release-notes

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

riodrwn
.