Cross-Site Scripting in CMS Made Simple User Management Module
CVE-2026-4225

4.8MEDIUM

Key Information:

Vendor

CMS Made Simple

Status
Cms Made Simple
Vendor
CVE Published:
16 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4225?

A security vulnerability exists in the User Management Module of CMS Made Simple versions up to 2.2.21. An attacker could exploit this flaw by manipulating the 'Message' argument in the 'admin/listusers.php' file to execute arbitrary JavaScript in the context of the user’s session. This remote exploit can lead to unauthorized actions and data theft, posing a serious risk to affected installations.

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Affected Version(s)

CMS Made Simple 2.2.0

CMS Made Simple 2.2.1

CMS Made Simple 2.2.2

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-2026-4225 - Proof of Concept

References

https://vuldb.com/?id.351148
vdb-entrytechnical-description
https://vuldb.com/?ctiid.351148
signaturepermissions-required
https://vuldb.com/?submit.770530
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

feioklucy (VulDB User)
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