The SuluFormBundle adds support for creating dynamic forms in Sulu Admin. The TokenController get parameter formName is not sanitized in the returned input field which leads to XSS. This vulnerability is fixed in 2.5.3.
https://github.com/sulu/SuluFormBundle/security/advisories/GHSA-rrvc-c7xg-7cf3
https://github.com/sulu/SuluFormBundle/commit/3f341b71a7309cbc8fd2c5bff894c654d1679b17