CVE-2026-4225

CMS Made Simple User Management listusers.php cross site scripting

Published Mar 16, 2026 CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed

Description

A security flaw has been discovered in CMS Made Simple up to 2.2.21. Impacted is an unknown function of the file admin/listusers.php of the component User Management Module. Performing a manipulation of the argument Message results in cross site scripting. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.

Analysis

Technical impact

The vulnerability in CMS Made Simple allows an attacker to inject malicious scripts through the Message argument in admin/listusers.php of the User Management Module. This cross‑site scripting flaw can execute arbitrary JavaScript in the browsers of users who view the content, enabling cookie theft, session hijacking, site defacement, or the delivery of additional payloads. The flaw is classified as CWE-79.

Affected Systems

CMS Made Simple versions up to and including 2.2.21 are affected. The flaw resides in admin/listusers.php and can be triggered by manipulating the Message parameter.

Risk and Exploitability

The CVSS score of 4.8 indicates a moderate severity, while the EPSS score of less than 1% suggests a low likelihood of widespread exploitation. The vulnerability is not listed in the CISA KEV and the exploit code is publicly available. Attackers can remotely exploit the flaw by sending a crafted Message parameter to an authenticated or unauthenticated user who views the affected page.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

CMS Made Simple

affected

Version	Status	Constraints
`2.2.0`	affected	—
`2.2.1`	affected	—
`2.2.2`	affected	—
`2.2.3`	affected	—
`2.2.4`	affected	—
`2.2.5`	affected	—
`2.2.6`	affected	—
`2.2.7`	affected	—
`2.2.8`	affected	—
`2.2.9`	affected	—
`2.2.10`	affected	—
`2.2.11`	affected	—
`2.2.12`	affected	—
`2.2.13`	affected	—
`2.2.14`	affected	—
`2.2.15`	affected	—
`2.2.16`	affected	—
`2.2.17`	affected	—
`2.2.18`	affected	—
`2.2.19`	affected	—
`2.2.20`	affected	—
`2.2.21`	affected	—

No data.

Vendor Product Versions

Cms Made Simple

Version	Status	Scheme	Platform
`[2.2.0,2.2.21]`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade CMS Made Simple to a version newer than 2.2.21, or apply any vendor-provided patch that addresses the XSS issue.
If an immediate upgrade is not possible, restrict access to admin/listusers.php to privileged users only and validate or sanitize the Message input parameter to remove script content.
Disable or remove the User Management Module until a secure version is available.

Generated by OpenCVE AI on March 17, 2026 at 11:41 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Low

Authentication Multiple

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.240% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/feixuezhi/cms/wiki
https://vuldb.com/?ctiid.351148
https://vuldb.com/?id.351148
https://vuldb.com/?submit.770530

History

Mar 16, 2026 6:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mar 16, 2026 8:00 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A security flaw has been discovered in CMS Made Simple up to 2.2.21. Impacted is an unknown function of the file admin/listusers.php of the component User Management Module. Performing a manipulation of the argument Message results in cross site scripting. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.
Title		CMS Made Simple User Management listusers.php cross site scripting
First Time appeared		Cms Made Simple Cms Made Simple cms Made Simple
Weaknesses		CWE-79 CWE-94
CPEs		cpe:2.3:a:cms_made_simple:cms_made_simple::::::::
Vendors & Products		Cms Made Simple Cms Made Simple cms Made Simple
References		https://github.com/feixuezhi/cms/wiki https://vuldb.com/?ctiid.351148 https://vuldb.com/?id.351148 https://vuldb.com/?submit.770530
Metrics		cvssV2_0 `{'score': 3.3, 'vector': 'AV:N/AC:L/Au:M/C:N/I:P/A:N/E:POC/RL:ND/RC:C'}` cvssV3_0 `{'score': 2.4, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C'}` cvssV3_1 `{'score': 2.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C'}` cvssV4_0 `{'score': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Cms Made Simple Cms Made Simple

Weaknesses

CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94
Improper Control of Generation of Code ('Code Injection')

Sources

CVE record Updated: Mar 16, 2026, 5:15 PM

Status: PUBLISHED
Assigner: VulDB
Published: Mar 16, 2026, 7:32 AM
Updated: Mar 16, 2026, 5:15 PM
Reserved: Mar 15, 2026, 6:36 PM

View source JSON

Vulnrichment Updated: Mar 16, 2026, 5:15 PM

Updated: Mar 16, 2026, 5:15 PM

JSON

NVD Updated: Jun 17, 2026, 10:56 AM

Status: Deferred
Published: Mar 16, 2026, 2:20 PM
Modified: Jun 17, 2026, 10:56 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment Updated: Mar 24, 2026, 10:45 AM

Updated: Mar 24, 2026, 10:45 AM

JSON

Analysis

Technical impact

Affected Systems

Risk and Exploitability

Affected Products

Remediation

Tracking

Advisories

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Low

Authentication Multiple

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

Exploitation poc

Automatable no

Technical Impact partial

Subscriptions

Sources

JSON object

JSON object

JSON object

JSON object

JSON object