CVE-2019-11870
Serendipity before 2.1.5 has XSS via EXIF data that is mishandled in the templates/2k11/admin/media_choose.tpl Editor Preview feature or the templates/2k11/admin/media_items.tpl Media Library feature.
Date published : 2019-05-09
https://blog.s9y.org/archives/282-Serendipity-2.1.5-released.html