Unrestricted File Upload Vulnerability in mingSoft MCMS 6.1.1
CVE-2026-2666

5.1MEDIUM

Key Information:

Vendor

Mingsoft

Status
Mcms
Vendor
CVE Published:
18 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2666?

A vulnerability exists in mingSoft MCMS version 6.1.1 within the Template Archive Handler component, specifically in the file upload process. This flaw allows an attacker to manipulate the 'File' argument, potentially enabling unauthorized file uploads without proper validation. This weakness can be exploited remotely, posing a significant risk as it could allow malicious files to be uploaded to the server, leading to further attacks or data breaches.

Affected Version(s)

MCMS 6.1.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-2666 - Proof of Concept

References

https://vuldb.com/?id.346463
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346463
signaturepermissions-required
https://vuldb.com/?submit.753243
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Unnlucky1 (VulDB User)
.