It has been discovered that missing request parameter validation could lead to Remote Code Execution.
Please read the advisory for a description and solutions of the issue:
TYPO3 Security Bulletin TYPO3-CORE-SA-2011-004: Remote Code Execution vulnerabilitiy in TYPO3 Core
In general the TYPO3 Security Team recommends to read the following pages:
- The TYPO3 Security Guide: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Security/Index.html#security-guidelines
- Make sure you are subscribed to the TYPO3 Announce List: http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce
- See all TYPO3 security advisories