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CVE-2021-47734

Cmsimple file inclusion

7.8 HIGHPublic exploitEPSS 0.78%
  1. Published23 Dec 2025

Description

CMSimple 5.4 contains an authenticated local file inclusion vulnerability that allows remote attackers to manipulate PHP session files and execute arbitrary code. Attackers can leverage the vulnerability by changing the functions file path and uploading malicious PHP code through session file upload mechanisms.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Cmsimple5.4

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-665668.1
Unauthenticated Local File Inclusion in Ambient <= 1.7…
CVE-2026-621158.1
Unauthenticated Local File Inclusion in KuteShop <= 4.2.9…
CVE-2026-620998.1
Unauthenticated Local File Inclusion in Boutique <= 2.3.3…
CVE-2026-620968.1
Unauthenticated Local File Inclusion in Biolife <= 3.2.3…
CVE-2026-620948.1
Unauthenticated Local File Inclusion in TechOne <= 3.0.3…
CVE-2026-620928.1
Unauthenticated Local File Inclusion in Armania <= 1.4.8…

Frequently asked

Is CVE-2021-47734 being actively exploited?

CVE-2021-47734 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.78%.

How severe is CVE-2021-47734?

CVE-2021-47734 has a CVSS 3.1 base score of 7.8, rated high. EPSS estimates a 0.78% probability of exploitation.

Which products are affected by CVE-2021-47734?

Affected products include Cmsimple.

How do I fix CVE-2021-47734?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-47734 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.