CVE-2025-69906: Monstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager plugin

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HIGH 8.8DOWNGRADE

CVE-2025-69906 is a high-severity flaw (CVSS 8.8) affecting monstra cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Monstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager plugin. The application relies on blacklist-based file extension validation and stores uploaded files directly in a web-accessible directory. Under typical server configurations, this can allow an attacker to upload files that are interpreted as executable code, resulting in remote code execution.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-02-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: monstra

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

Am I affected?

Timeline

2026-02-05 17:16 UTCPublished CVE record published
2026-06-17 10:00 UTCUpdated Record last modified

monstra monstra cms DOWNGRADE

Affected: 3.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.4

1. Check installed version

apt-cache policy monstra-cms || rpm -q monstra-cms || monstra-cms --version

2. No fixed release: DOWNGRADE to a release before 3.0.4 (Debian / Ubuntu)

apt-cache madison monstra-cms sudo apt install monstra-cms=<VERSION_BEFORE_3.0.4> sudo apt-mark hold monstra-cms

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

dnf --showduplicates list monstra-cms sudo dnf downgrade monstra-cms-<VERSION_BEFORE_3.0.4> sudo dnf versionlock add monstra-cms

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-2025-69906?

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

Is CVE-2025-69906 being exploited?

CVE-2025-69906 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-2025-69906 affect?

CVE-2025-69906 affects monstra cms. Severity is high (CVSS 8.8). Monstra CMS v3.0.4 contains an arbitrary file upload vulnerability in the Files Manager plugin. The application relies on blacklist-based file extension validation and stores uploaded files directly in a web-accessible directory. Under typi

How urgent is CVE-2025-69906?

Priority 50/100. High severity; Public exploit reference

References

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