Multiple Cross-Site Scripting (XSS) Vulnerabilities in Mailcow
Mailcow is a widely used self-hosted and open source email server that hosts everything you'd need to manage mailboxes yourself. To assess its security, we set up a local instance and ran our AI pentesting agents against it. We found three XSS vulnerabilities, including a critical vulnerability that allowed unauthenticated attackers to take over administrator accounts while looking at their logs in the UI. Gaining access to a mailbox can have a serious security impact.