An issue was discovered in Ampache through 3.9.1. The search engine is affected by a SQL Injection, so any user able to perform lib/class/search.class.php searches (even guest users) can dump any data contained in the database (sessions, hashed passwords, etc.). This may lead to a full compromise of admin accounts, when combined with the weak password generator algorithm used in the lostpassword functionality.
https://www.tarlogic.com/en/blog/vulnerabilities-in-ampache/
https://lists.debian.org/debian-lts-announce/2019/11/msg00008.html