In Eclipse Jetty version 9.2.26 and older, 9.3.25 and older, and 9.4.15 and older, the server is vulnerable to XSS conditions if a remote client USES a specially formatted URL against the DefaultServlet or ResourceHandler that is configured for showing a Listing of directory contents.
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.debian.org/security/2021/dsa-4949
https://security.netapp.com/advisory/ntap-20190509-0003/
https://lists.debian.org/debian-lts-announce/2021/05/msg00016.html