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CRITICAL severity

CVE-2021-46386 — ms-mcms

CRITICAL

CVE-2021-46386 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability in net.mingsoft:ms-mcms. 1 public exploit reference exists, so weaponization risk is real. No vendor fix is recorded yet; mitigation options are listed below.

Mingsoft MCMS vulnerable to Remote Code Execution via file upload.

Published
Updated
Affected
1 pkg
Patched
See advisory
Exploits
1 known
Exploitation data as of Oct 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
3.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs87th percentile — riskier than 87% of all scored CVEsHighest risk
2.13%3.88%5.63%7.38%6.4%3.1%May 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-46386 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
☕net.mingsoft:ms-mcms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Mingsoft MCMS is a Java CMS. Versions prior to and including 5.2.5 contain a file upload vulnerability allowing for a jspx webshell to be uploaded via net.mingsoft.basic.action.web.FileAction#upload, resulting in remote code execution. It is unclear if this issue has been patched.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
☕Mavennet.mingsoft:ms-mcmsall versionsNo fix

Affected Products

1 product · 1 configurations
Application
mcmsmingsoft
≤ 5.2.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

File upload vulnerability in mingSoft MCMS through 5.2.5, allows remote …

gitee.comNVDFeb 2022

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for net.mingsoft:ms-mcms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of net.mingsoft:ms-mcms has shipped for CVE-2021-46386 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

Mingsoft MCMS is a Java CMS. Versions prior to and including 5.2.5 contain a file upload vulnerability allowing for a jspx webshell to be uploaded via net.mingsoft.basic.action.web.FileAction#upload, resulting in remote code execution. It is unclear if this issue has been patched.
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CVE-2021-46386: ms-mcms RCE (Critical 9.8)