CVE-2026-2666: Ms mcms MingSoft MCMS Does Not Properly Vulnerability

LOW
Advisory Identifier: GHSA-r9wp-qq53-qvjx
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CVSS 4.7
CWE-284
Published
Advisory Summary

CVE-2026-2666 is a LOW (CVSS 4.7) mingsoft mcms does not properly vulnerability (CWE-284: Improper Access Control) affecting Ms mcms libraries in the Maven ecosystem. The issue involves mingsoft mcms does not properly restrict file uploads. Remediation is available in the latest vendor maintenance releases.

CVE-2026-2666 at a Glance

CVE Identifier CVE-2026-2666
GHSA Identifier GHSA-r9wp-qq53-qvjx
Severity LOW
CVSS v3.1 Base Score 4.7
CWE Classification CWE-284: Improper Access Control
Affected Product Ms mcms
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-2666

To remediate this vulnerability, upgrade all affected Ms mcms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

net.mingsoft:ms-mcms fixed: Latest secure release 
<dependency>
    <groupId>net.mingsoft</groupId>
    <artifactId>ms-mcms</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=net.mingsoft

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-2666, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=net.mingsoft

Analyze the terminal output to locate any version of Ms mcms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree -Dincludes=net.mingsoft command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Ms mcms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A flaw has been found in mingSoft MCMS 6.1.1. The affected element is an unknown function of the file /ms/file/uploadTemplate.do of the component Template Archive Handler. Executing a manipulation of the argument File can lead to unrestricted upload. The attack can be launched remotely. The exploit has been published and may be used.

CVE-2026-2666 Affected Ms mcms Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
net.mingsoft:ms-mcms
maven/net.mingsoft/ms-mcms
Maven
≤ 6.1.1

References

NVD — CVE-2026-2666 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2666
Ms mcms Source Repository REPOSITORY
https://github.com/chujianxin0101/vuln/issues/11
Ms mcms Source Repository REPOSITORY
https://github.com/ming-soft/MCMS
vuldb.com/ WEB
https://vuldb.com/?ctiid.346463
vuldb.com/ WEB
https://vuldb.com/?id.346463
vuldb.com/ WEB
https://vuldb.com/?submit.753243

Frequently Asked Questions

What is CVE-2026-2666?
CVE-2026-2666 is a security vulnerability in Ms mcms involving mingSoft MCMS does not properly restrict file uploads under CWE-284: Improper Access Control.
Which Ms mcms versions are affected?
Affected versions include releases prior to current release patches across affected packages: net.mingsoft:ms-mcms.
What version fixes CVE-2026-2666?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is ms-mcms affected?
Yes, net.mingsoft:ms-mcms is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-2666?
CVE-2026-2666 has a CVSS v3.1 base score of 4.7 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-2666?
CVE-2026-2666 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check Maven dependencies for CVE-2026-2666?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=net.mingsoft'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r9wp-qq53-qvjx",
  "modified" : "2026-02-19T20:30:51Z",
  "published" : "2026-02-18T21:31:23Z",
  "aliases" : [ "CVE-2026-2666" ],
  "summary" : "mingSoft MCMS does not properly restrict file uploads",
  "details" : "A flaw has been found in mingSoft MCMS 6.1.1. The affected element is an unknown function of the file /ms/file/uploadTemplate.do of the component Template Archive Handler. Executing a manipulation of the argument File can lead to unrestricted upload. The attack can be launched remotely. The exploit has been published and may be used.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "net.mingsoft:ms-mcms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "6.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-2666"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/chujianxin0101/vuln/issues/11"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ming-soft/MCMS"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?ctiid.346463"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?id.346463"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/?submit.753243"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-19T20:30:51Z",
    "nvd_published_at" : "2026-02-18T20:18:37Z"
  }
}