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TYPO3 Arbitrary Code Execution vulnerability on the backend

typo3/cms-backend Updated 02 Oct 2025

Summary

21/04/2022
CVE-2010-3663
Yes i
High
8.8

CVE-2010-3663: TYPO3 Arbitrary Code Execution vulnerability on the backend. Affects typo3/cms-backend across 4 version ranges.

< 4.1.14 >= 4.2, < 4.2.13 >= 4.3, < 4.3.4 >= 4.4, < 4.4.1

Fixed in 4 releases; the minimum fixed version depends on the release line you run. How to fix ↓

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TYPO3 before 4.1.14, 4.2.x before 4.2.13, 4.3.x before 4.3.4 and 4.4.x before 4.4.1 contains an insecure default value of the variable fileDenyPattern which could allow remote attackers to execute arbitrary code on the backend.

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

  • < 4.1.14 4.1.14 
    composer require typo3/cms-backend:4.1.14
  • >= 4.2, < 4.2.13 4.2.13 
    composer require typo3/cms-backend:4.2.13
  • >= 4.3, < 4.3.4 4.3.4 
    composer require typo3/cms-backend:4.3.4
  • >= 4.4, < 4.4.1 4.4.1 
    composer require typo3/cms-backend:4.4.1

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Recent vulnerabilities recorded for typo3/cms-backend.

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How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

  • < 4.1.14 4.1.14 
    composer require typo3/cms-backend:4.1.14
  • >= 4.2, < 4.2.13 4.2.13 
    composer require typo3/cms-backend:4.2.13
  • >= 4.3, < 4.3.4 4.3.4 
    composer require typo3/cms-backend:4.3.4
  • >= 4.4, < 4.4.1 4.4.1 
    composer require typo3/cms-backend:4.4.1

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

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