CVE-2026-2666Public exploitNetwork attack vector

Authenticated code execution via racy archive validation

Published Feb 18, 2026 · Updated Feb 18, 2026

Unrestricted file upload in MingSoft MCMS 6.1.1 allows remote authenticated users to execute server-side code via a crafted template archive. The uploadTemplate.do handler extracts archive entries before checking and deleting prohibited files, leaving malicious JSP content temporarily web-accessible. Administrative access and successful timing of that validation gap are required; exploitation grants code execution in the MCMS server context.

CVSS severity4.7
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in MingSoft MCMS 6.1.1 allows remote authenticated users to execute server-side code via a crafted template archive. The uploadTemplate.do handler extracts archive entries before checking and deleting prohibited files, leaving malicious JSP content temporarily web-accessible. Administrative access and successful timing of that validation gap are required; exploitation grants code execution in the MCMS server context.

The record

CVE
CVE-2026-2666
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
MingSoft
Product
MCMS
Classifications
CWE-284, CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

MingSoft · MCMSversion=6.1.1

Published CVSS scores

7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P
2.0VulDBCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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