CVE-2026-18028 in pretix
Summary
by MITRE • 07/28/2026
The "quick setup" view presented to users after they first create an event allows to set up the most critical parts of an event in just a few clicks. This view did not properly check that the user has permission to change configuration for the given event. An attacker could use a well-timed request to create products, quotas, set bank transfer configuration, or connect a stripe account to an event they do not have access to.
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Analysis
by VulDB Data Team • 07/28/2026
This vulnerability represents a critical authorization flaw in the event management system's quick setup functionality, where the application fails to properly validate user permissions before allowing configuration changes. The issue stems from insufficient access control validation within the rapid setup interface that is designed to streamline event creation processes for legitimate users. When attackers exploit this weakness, they can manipulate API requests to perform administrative actions on events they do not own or have authorization to modify.
The technical implementation of this vulnerability demonstrates a classic privilege escalation scenario where the system assumes users have appropriate permissions based solely on their ability to initiate the quick setup process. This flaw likely exists in the backend validation logic that should verify user credentials and ownership rights before executing configuration modifications. The absence of proper permission checks means that attackers can bypass normal access controls by crafting specific requests that target the event configuration endpoints directly, effectively allowing them to perform actions such as creating products, establishing quotas, configuring bank transfers, or connecting stripe accounts to unauthorized events.
The operational impact of this vulnerability extends beyond simple data manipulation, as it provides attackers with significant control over event financial configurations and payment processing capabilities. An attacker who successfully exploits this issue could potentially monetize unauthorized events by setting up payment methods, creating products for sale, and establishing billing structures that would benefit the attacker rather than the legitimate event organizer. This represents a serious security risk that could lead to financial loss, unauthorized revenue generation, and potential compliance violations related to payment processing and data handling.
This vulnerability aligns with CWE-285: "Improper Authorization" and represents a failure in the principle of least privilege enforcement within the application's access control mechanisms. From an attack framework perspective, this issue maps to ATT&CK technique T1078: "Valid Accounts" and T1496: "Resource Hijacking" as attackers could leverage this weakness to gain unauthorized access to event resources and financial systems. The vulnerability is particularly concerning because it operates at the configuration level rather than simply accessing data, meaning that attackers can fundamentally alter how events operate within the platform.
Mitigation strategies should focus on implementing robust permission validation throughout all stages of the quick setup process, ensuring that each configuration change is verified against user credentials and event ownership before execution. The system should enforce authorization checks at the API level for all administrative functions, regardless of whether users are in a quick setup workflow or standard management interface. Additionally, implementing proper audit logging for all configuration changes would help detect unauthorized modifications and provide forensic data for incident response activities. Regular security testing of access control mechanisms and mandatory authorization validation for all user actions should become standard practice to prevent similar issues from occurring in the future.