TYPO3 < 8.7.11 and 9.1.0 - Stored Cross-Site Scripting via Site Name Configuration
The page module in TYPO3 before 8.7.11, and 9.1.0, has XSS via $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'], as demonstrated by an admin entering a crafted site name during the installation process.