HTTP ERROR 500 org.springframework.security.web.firewall.RequestRejectedException: The request was rejected because the URL contained a potentially malicious String "%25"

URI:/ansatte/R%25EF%25BF%25BD%25EF%25BF%25BDff%2520spr%25EF%25BF%25BD%25EF%25BF%25BDkbruk%2520preger%2520omgangstonen%2520blant%2520mange%2520barn%2520og%2520unge.%2520Men%2520forst%25EF%25BF%25BD%25EF%25BF%25BDr%2520de%2520egentlig%2520ordene%2520de%2520bruker
STATUS:500
MESSAGE:org.springframework.security.web.firewall.RequestRejectedException: The request was rejected because the URL contained a potentially malicious String "%25"
SERVLET:dispatcherServlet
CAUSED BY:org.springframework.security.web.firewall.RequestRejectedException: The request was rejected because the URL contained a potentially malicious String "%25"