A flaw in the database escaping API results in a SQL injection vulnerability when extension dbal is enabled and configured for MySQL passthrough mode in its extension configuration. All queries which use the DatabaseConnection::sql_query are vulnerable, even if arguments were properly escaped with DatabaseConnection::quoteStr beforehand.

References

• https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/2016-02-16-1.yaml
• https://typo3.org/article/typo3-core-sa-2016-001