Mortazavim

**Name of the Vulnerable Software and Affected Versions** Mailcow versions through 2024-11b **Description** The issue is related to a session fixation vulnerability in the web panel. It allows remote attackers to set a session identifier when HSTS is disabled on a victim's browser. After a user logs in, they are authenticated and the session identifier is valid. Then, a remote attacker can access the victim's web panel with the same session identifier. The application does not disable old session IDs, which allows a remote attacker to use existing IDs in the victim's browser. **Recommendations** For Mailcow versions through 2024-11b, consider disabling the login functionality until a patch is available, or restrict access to the web panel to minimize the risk of exploitation. As a temporary workaround, users can enable HSTS on their browsers to mitigate the risk. At the moment, there is no information about a newer version that contains a fix for this vulnerability.