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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.

PUBLISHED Reserved 2026-04-05 | Published 2026-04-08 | Updated 2026-04-08 | Assigner rami.io




MEDIUM: 5.5CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H

Problem types

CWE-653 Improper isolation or compartmentalization

Product status

Default status
unaffected

2025.10.0 (python) before 2026.1.2
affected

2026.2.0 (python) before 2026.2.1
affected

2026.3.0 (python) before 2026.3.1
affected

Credits

Pratik Karan finder

References

pretix.eu/about/en/blog/20260408-release-2026-3-1/

cve.org (CVE-2026-5600)

nvd.nist.gov (CVE-2026-5600)

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