CVE-2026-5333: A security flaw has been discovered in DefaultFuction Content-Management-System 1.0

This week

HIGH 7.3REMOTEDOWNGRADE

CVE-2026-5333 is a high-severity flaw (CVSS 7.3) affecting content management system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A security flaw has been discovered in DefaultFuction Content-Management-System 1.0. This issue affects some unknown processing of the file /admin/tools.php. The manipulation of the argument host results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-74, CWE-77
Published	2026-04-02
Last modified	2026-10-26

Publisher (CNA): VulDB · Vendor: defaultfuction

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

Am I affected?

Timeline

2026-04-02 14:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

defaultfuction content management system DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy content-management-system || rpm -q content-management-system || content-management-system --version

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison content-management-system sudo apt install content-management-system=<VERSION_BEFORE_1.0> sudo apt-mark hold content-management-system

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

dnf --showduplicates list content-management-system sudo dnf downgrade content-management-system-<VERSION_BEFORE_1.0> sudo dnf versionlock add content-management-system

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/DefaultFuction/Content-Management-System/issues/1
Write-up: github.com/DefaultFuction/Content-Management-System/issues/1#issue-4082558620

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-2026-5333?

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

Is CVE-2026-5333 being exploited?

CVE-2026-5333 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-2026-5333 affect?

CVE-2026-5333 affects content management system. Severity is high (CVSS 7.3). A security flaw has been discovered in DefaultFuction Content-Management-System 1.0. This issue affects some unknown processing of the file /admin/tools.php. The manipulation of the argument host results in command injection. The attack can

How urgent is CVE-2026-5333?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-0546 HIGH 7.3 DOWNGRADE A vulnerability was determined in code-projects Content Management System 1.0

References

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