pretix pretix-mollie input validation

Summaryinfo

A vulnerability classified as problematic was found in pretix pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort and pretix-saferpay. Affected is an unknown function. Executing a manipulation can lead to input validation. This vulnerability is registered as CVE-2026-13602. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in pretix pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort and pretix-saferpay. It has been declared as problematic. This vulnerability affects an unknown function. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. The impact remains unknown. CVE summarizes:

We found a chain of combining multiple weaknesses in the product that could allow an attacker to become any user in the backend and access any data: * The payment integration plugins Stripe (included in the core system), pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort, and pretix-saferpay contain a code path that is intended for the transport of session parameters from a tab with isolated cookies (e.g. in the pretix widget) to a new tab. For this purpose, a set of session parameters is cryptographically signed and then passed to the new tab as a URL parameter. The plugins perform no further validation of the session parameters, other than the cryptographic signature being valid. This is fixed with the releases issued today by strictly validating that no session parameters outside of the scope of the respective plugin may be set. * An unrelated feature in the core system is used to generate redirect links that obfuscate any Referer headers for outgoing links to prevent leakage of secrets in URLs. This redirect page also requires cryptographically signed parameters. Unfortunately, it uses the same key and salt for the signature as the previously mentioned feature in the payment integration plugins. A motivated attacker with access to at least one event in the backend can trick the system into cryptographically signing arbitrary content using specially crafted links. In combination with the previous issue, the attacker could use this to set and modify arbitrary parameters on their user session by injecting the signed parameters into the feature of the payment providers. This is fixed with the releases issued today by using different salts for the signature for each plugin and feature. * A third, unrelated feature in the core system is used for admin users to act on behalf of another user, mostly for debugging purposes. With being able to insert arbitrary parameters into a session, an attacker can abuse this feature to change their session from their actual user to any user in the system by guessing a valid user ID. This is fixed with the release today by requiring unguessable information to be contained in the session of the user to switch to.

The advisory is available at pretix.eu. This vulnerability was named CVE-2026-13602 since 06/29/2026. The exploitation appears to be difficult. The technical details are unknown and an exploit is not available.

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• pretix

Name

• pretix-bitpay
• pretix-mollie
• pretix-oppwa
• pretix-payone
• pretix-saferpay
• pretix-secuconnect
• pretix-sofort

CPE 2.3info

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CPE 2.2info

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Entryinfo

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