copyparty is a portable file server. In versions up to and including versions 1.18.4, an unauthenticated attacker is able to execute arbitrary JavaScript code in a victim's browser due to improper sanitization of multimedia tags in music files, including m3u files. This is fixed in version 1.18.5.
https://github.com/9001/copyparty/security/advisories/GHSA-9q4r-x2hj-jmvr
https://github.com/9001/copyparty/releases/tag/v1.18.5
https://github.com/9001/copyparty/commit/895880aeb0be0813ddf732487596633f8f9fc3a6