# Tellersonne - how to report a security problem (RFC 9116)
Contact: mailto:security@tellersonne.app
Contact: mailto:hello@tellersonne.app
Expires: 2027-06-30T00:00:00.000Z
Preferred-Languages: de, en
Canonical: https://tellersonne.app/.well-known/security.txt
Policy: https://tellersonne.app/sicherheit