A vulnerability was identified in janeczku Calibre-Web up to 0.6.26. The impacted element is the function generate_auth_token of the file cps/kobo_auth.py of the component Endpoint. Such manipulation of the argument user_id leads to improper authorization.

The attack may be launched remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.