CVE-2026-5600 pretix: API leaks check-in data between events of the same organizer
An API flaw in pretix allows unauthorized users to view check-in data for all events under an organizer, exposing ticket scan details.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-5600?
CVE-2026-5600 is a medium-severity missing authorization vulnerability in pretix, published on 8 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-653
Which versions are affected by CVE-2026-5600?
7 open source packages ship an affected version, including pretix. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
pretix PyPI | From 2025.10.0 | 2026.1.2, 2026.2.1, 2026.3.1 |
pretix PyPI | From 2025.10.0 | 2026.1.2 |
pretix PyPI | From 2025.10.0 | 2026.1.2 |
pretix PyPI | From 2026.2.0 | 2026.2.1 |
pretix PyPI | From 2026.2.0 | 2026.2.1 |
pretix PyPI | From 2026.3.0 | 2026.3.1 |
1 more packages
pretix PyPI | From 2026.3.0 | 2026.3.1 |
Products include Pretix Pretix.
How do I fix CVE-2026-5600?
Upgrade pretix to a fixed version for your release line: 2026.1.2, 2026.2.1 or 2026.3.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-5600 being exploited?
There is no known exploitation of CVE-2026-5600 in the wild and no public exploit code.
Other vulnerabilities in pretix
Sources
Also known as GHSA-wr8q-c73g-m7gp, PYSEC-2026-111.