CVE-2023-5812Public exploitNetwork attack vector

Authenticated code execution via unchecked upload extension

Published Oct 27, 2023 · Updated Aug 2, 2024

Unrestricted file upload in Flusity CMS allows remote authenticated users to upload and execute PHP files through the file manager. The core/tools/upload.php handleFileUpload path trusts an allowed client-supplied MIME type but does not reject executable filename extensions. Access to the backend file manager is required; an attacker can store a PHP payload in the web-accessible uploads area and run it on the server.

CVSS severity4.7
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Flusity CMS allows remote authenticated users to upload and execute PHP files through the file manager. The core/tools/upload.php handleFileUpload path trusts an allowed client-supplied MIME type but does not reject executable filename extensions. Access to the backend file manager is required; an attacker can store a PHP payload in the web-accessible uploads area and run it on the server.

The record

CVE
CVE-2023-5812
Published
Oct 27, 2023
Updated
Aug 2, 2024
Vendor
Flusity
Product
Flusity CMS
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Flusity · Flusity CMSversion=n/a

Published CVSS scores

4.7VulDBCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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