The call parameter of /lib/exe/ajax.php in DokuWiki through 2017-02-19e does not properly encode user input, which leads to a reflected file download vulnerability, and allows remote attackers to run arbitrary programs.
https://lists.debian.org/debian-lts-announce/2018/07/msg00004.html
https://lists.debian.org/debian-lts-announce/2018/02/msg00004.html
https://hackerone.com/reports/238316
https://github.com/splitbrain/dokuwiki/pull/2019
https://github.com/splitbrain/dokuwiki/commit/238b8e878ad48f370903465192b57c2072f65d86