CVE-2026-2666: A flaw has been found in mingSoft MCMS 6.1.1

Routine

MEDIUM 4.7DOWNGRADE

CVE-2026-2666 is a medium-severity flaw (CVSS 4.7) affecting mcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-284, CWE-434
Published	2026-02-18
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: mingsoft

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-18 20:18 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

mingsoft mcms DOWNGRADE

Affected: 6.1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.1.1

1. Check installed version

apt-cache policy mcms || rpm -q mcms || mcms --version

2. No fixed release: DOWNGRADE to a release before 6.1.1 (Debian / Ubuntu)

apt-cache madison mcms sudo apt install mcms=<VERSION_BEFORE_6.1.1> sudo apt-mark hold mcms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mcms sudo dnf downgrade mcms-<VERSION_BEFORE_6.1.1> sudo dnf versionlock add mcms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2666?

mcms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-2666 being exploited?

CVE-2026-2666 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2666 affect?

CVE-2026-2666 affects mcms. Severity is medium (CVSS 4.7). 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 unrestrict

How urgent is CVE-2026-2666?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2025-60838 MEDIUM 6.5 UPGRADE An arbitrary file upload vulnerability in MCMS v6.0.1 allows attackers to execute arbitrary code via uploading
CVE-2025-60837 MEDIUM 6.1 UPGRADE A reflected cross-site scripting (XSS) vulnerability in MCMS v6.0.1 allows attackers to execute arbitrary Java
CVE-2025-29287 CRITICAL 9.8 DOWNGRADE An arbitrary file upload vulnerability in the ueditor component of MCMS v5.4.3 allows attackers to execute arb
CVE-2025-56316 CRITICAL 9.8 DOWNGRADE A SQL injection vulnerability in the content_title parameter of the /cms/content/list endpoint in MCMS 5.5.0 a
CVE-2024-42991 HIGH 8.1 DOWNGRADE MCMS v5.4.1 has front-end file upload vulnerability which can lead to remote command execution.

References

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