pretix vulnerabilities

Malicious HTML content could be injected into the page pretix shows when redirection to an untrusted page occurs. Since this page has a Content-Security-Policy, this can mainly be used for phishing purposes.

Malicious HTML content could be injected into the email address of an order, which pretix showed without sanitization on the confirmation page for individual tickets in that order.

A chain of vulnerabilities was found in pretix: payment plugins (Stripe, Mollie, OPPWA, BitPay, Payone, SecuConnect, Sofort, Saferpay) do not validate session parameters beyond cryptographic signature, the redirect feature uses the same key and salt for signing as the plugins, and the admin impersonation feature allows changing user after injecting arbitrary parameters. An attacker with access to at least one event can become any backend user and access all data.

Pretix 2025 introduces a new API endpoint that returns check-in data for all events of an organizer instead of a specific event. This allows unauthorized users to access check-in information for other events.