Kiwi TCMS, an open source test management system, does not impose rate limits in versions prior to 12.0. This makes it easier to attempt denial-of-service attacks against the Password reset page. An attacker could potentially send a large number of emails if they know the email addresses of users in Kiwi TCMS. Additionally that may strain SMTP resources. Users should upgrade to v12.0 or later to receive a patch. As potential workarounds, users may install and configure a rate-limiting proxy in front of Kiwi TCMS and/or configure rate limits on their email server when possible.
https://kiwitcms.org/blog/kiwi-tcms-team/2023/02/15/kiwi-tcms-120/
https://huntr.dev/bounties/3b712cb6-3fa3-4f71-8562-7a7016c6262e
https://github.com/kiwitcms/Kiwi/security/advisories/GHSA-7j9h-3jxf-3vrf
https://github.com/kiwitcms/Kiwi/commit/761305d04f5910ba14cc04d1255a8f1afdbb87f3