CVE-2026-5600

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.

Kodem intelligence

1. What is CVE-2026-5600? CVE-2026-5600 is a medium-severity security vulnerability in pretix (pip), affecting versions >= 2026.3.0, < 2026.3.1. It is fixed in 2026.3.1, 2026.2.1, 2026.1.2.
2. Which versions of pretix are affected by CVE-2026-5600? pretix (pip) versions >= 2026.3.0, < 2026.3.1 is affected.
3. Is there a fix for CVE-2026-5600? Yes. CVE-2026-5600 is fixed in 2026.3.1, 2026.2.1, 2026.1.2. Upgrade to this version or later.
4. Is CVE-2026-5600 exploitable, and should I be worried? Whether CVE-2026-5600 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2026-5600 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2026-5600?
   • Upgrade pretix to 2026.3.1 or later
   • Upgrade pretix to 2026.2.1 or later
   • Upgrade pretix to 2026.1.2 or later