CVE-2025-51511: Cadmium CMS v.0.4.9 has a background arbitrary file upload vulnerability in /admin/content/filemanager/uploads

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2025-51511 is a critical-severity flaw (CVSS 9.8) affecting cadmium cms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cadmium CMS v.0.4.9 has a background arbitrary file upload vulnerability in /admin/content/filemanager/uploads.

Why this priority

Critical 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-12-23
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: cadmium-cms

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-23 18:15 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

cadmium-cms cadmium cms DOWNGRADE

Affected: 0.4.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.4.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.4.9 (Debian / Ubuntu)

apt-cache madison cadmium-cms sudo apt install cadmium-cms=<VERSION_BEFORE_0.4.9> sudo apt-mark hold cadmium-cms

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

dnf --showduplicates list cadmium-cms sudo dnf downgrade cadmium-cms-<VERSION_BEFORE_0.4.9> sudo dnf versionlock add cadmium-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-2025-51511?

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

Is CVE-2025-51511 being exploited?

CVE-2025-51511 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-2025-51511 affect?

CVE-2025-51511 affects cadmium cms. Severity is critical (CVSS 9.8). Cadmium CMS v.0.4.9 has a background arbitrary file upload vulnerability in /admin/content/filemanager/uploads.

How urgent is CVE-2025-51511?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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