CVE-2026-5600

/// Technical description

A new API endpoint introduced in pretix 2025 that is supposed to

return all check-in events of a specific event in fact returns all

check-in events belonging to the respective organizer. This allows an

API consumer to access information for all other events under the same

organizer, even those they should not have access to.

These records contain information on the time and result of every ticket scan as well as the ID of the matched ticket. Example:

{

"id": 123,

"successful": true,

"error_reason": null,

"error_explanation": null,

"position": 321,

"datetime": "2020-08-23T09:00:00+02:00",

"list": 456,

"created": "2020-08-23T09:00:00+02:00",

"auto_checked_in": false,

"gate": null,

"device": 1,

"device_id": 1,

"type": "entry"

}

An unauthorized user usually has no way to match these IDs (position) back to individual people.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References