Previously, maliciously crafted email addresses could be used to sneak HTML code into the HedgeDoc editor, since HedgeDoc uses the local part of the address as a display name for users. We're now sanitizing this using DOMPurify. Co-authored-by: Philip Molares <philip.molares@udo.edu> Signed-off-by: Erik Michelson <github@erik.michelson.eu>