Galette is a membership management web application geared towards non profit organizations. In versions prior to 0.9.5, malicious javascript code can be stored to be displayed later on self subscription page. The self subscription feature can be disabled as a workaround (this is the default state). Malicious javascript code can be executed (not stored) on login and retrieve password pages. This issue is patched in version 0.9.5.
https://github.com/galette/galette/security/advisories/GHSA-vjc9-mj44-x59q
https://github.com/galette/galette/commit/f54b2570615d38d0302e937079233e52c2d80995
https://github.com/galette/galette/commit/8f3bdd9f7d0708466e011253064a867ca2b271a5
https://github.com/galette/galette/commit/514418da973ae5b84bf97f94bd288a41e8e3f0a6