CVE-2024-42991: MCMS v5.4.1 has front-end file upload vulnerability which can lead to remote command execution.

This week

HIGH 8.1REMOTEDOWNGRADE

CVE-2024-42991 is a high-severity flaw (CVSS 8.1) affecting mcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MCMS v5.4.1 has front-end file upload vulnerability which can lead to remote command execution.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-434
Published	2024-09-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mingsoft

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

Am I affected?

Timeline

2024-09-03 16:15 UTCPublished CVE record published
2026-06-17 07:50 UTCUpdated Record last modified

mingsoft mcms DOWNGRADE

Affected: 5.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.4.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.4.1 (Debian / Ubuntu)

apt-cache madison mcms sudo apt install mcms=<VERSION_BEFORE_5.4.1> sudo apt-mark hold mcms

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

dnf --showduplicates list mcms sudo dnf downgrade mcms-<VERSION_BEFORE_5.4.1> 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-2024-42991?

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

Is CVE-2024-42991 being exploited?

CVE-2024-42991 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-2024-42991 affect?

CVE-2024-42991 affects mcms. Severity is high (CVSS 8.1). MCMS v5.4.1 has front-end file upload vulnerability which can lead to remote command execution.

How urgent is CVE-2024-42991?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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-2026-2666 MEDIUM 4.7 DOWNGRADE A flaw has been found in mingSoft MCMS 6.1.1
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

References

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