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Medium

Neos Flow Arbitrary file upload and XML External Entity processing

  • Disclosed: 17.05.2024
  • Updated: 11.10.2026 10:22

It has been discovered that Flow 3.0.0 allows arbitrary file uploads, inlcuding server-side scripts, posing the risk of attacks. If those scripts are executed by the server when accessed through their public URL, anything not blocked through other means is possible (information disclosure, placement of backdoors, data removal, …).

Note: The upload of files is only possible if the application built on Flow provides means to do so, and whether or not the upload of files poses a risk is dependent on the system setup. If uploaded script files are not executed by the server, there is no risk. In versions prior to 3.0.0 the upload of files with the extension php was blocked.

In Flow 2.3.0 to 2.3.6 a potential XML External Entity processing vulnerability has been discovered in the MediaTypeConverter.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package neos/flow >= 2.3.0, < 2.3.7, >= 3.0.0, < 3.0.1 2.3.7, 3.0.1

References

CVSS score -
Weakness (CWE)
-
Platform
Composer
Package
neos/flow
Disclosed
17.05.2024
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-5vv7-j593-mgjc - CC BY 4.0

Vulnerability history: neos/flow

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries
5
First → latest
05.2022 05.2024
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Medium 4
  • Low 1

Disclosures per year

  1. Time-Based Information Disclosure Vulnerability in Flow
    Medium · 5.3 ghsa-6pq8-67pw-j6hw >= 2.3.0, < 2.3.16, >= 3.0.0, < 3.0.10, >= 3.1.0, < 3.1.7, >= 3.2.0, < 3.2.7, >= 3.3.0, < 3.3.5 2.3.16, 3.0.10, 3.1.7, 3.2.7, 3.3.5
  2. Neos Flow Information disclosure in entity security
    Medium · 4.3 ghsa-9cw3-j7wg-jwj8 >= 3.0.0, < 3.0.12, >= 3.1.0, < 3.1.10, >= 3.2.0, < 3.2.13, >= 3.3.0, < 3.3.13, >= 4.0.0, < 4.0.6 3.0.12, 3.1.10, 3.2.13, 3.3.13, 4.0.6
  3. Neos Flow Arbitrary file upload and XML External Entity processing this entry
    Medium ghsa-5vv7-j593-mgjc >= 2.3.0, < 2.3.7, >= 3.0.0, < 3.0.1 2.3.7, 3.0.1
  4. Insecure deserialize Vulnerability in FLOW3
    Low · 3.7 ghsa-7h74-7vcw-4mwp >= 1.0.0, < 1.0.4 1.0.4
  5. TYPO3 Flow Cross-site scripting (XSS) vulnerability
    Medium CVE-2013-7082 >= 1.1.0, < 1.1.1, >= 2.0.0, < 2.0.1 1.1.1, 2.0.1

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