PYSEC-2026-111
Vulnerability from pysec - Published: 2026-04-08 13:16 - Updated: 2026-05-20 09:19A 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.
| Name | purl | pretix | pkg:pypi/pretix |
|---|
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "pretix",
"purl": "pkg:pypi/pretix"
},
"ranges": [
{
"events": [
{
"introduced": "2025.10.0"
},
{
"fixed": "2026.1.2"
},
{
"introduced": "2026.2.0"
},
{
"fixed": "2026.2.1"
},
{
"introduced": "2026.3.0"
},
{
"fixed": "2026.3.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2025.10.0",
"2025.10.1",
"2025.10.2",
"2026.1.0",
"2026.1.1",
"2026.2.0",
"2026.3.0"
]
}
],
"aliases": [
"CVE-2026-5600",
"GHSA-wr8q-c73g-m7gp"
],
"details": "A new API endpoint introduced in pretix 2025 that is supposed to \nreturn all check-in events of a specific event in fact returns all \ncheck-in events belonging to the respective organizer. This allows an \nAPI consumer to access information for all other events under the same \norganizer, even those they should not have access to.\n\n\nThese records contain information on the time and result of every ticket scan as well as the ID of the matched ticket. Example:\n\n\n{\n \"id\": 123,\n \"successful\": true,\n \"error_reason\": null,\n \"error_explanation\": null,\n \"position\": 321,\n \"datetime\": \"2020-08-23T09:00:00+02:00\",\n \"list\": 456,\n \"created\": \"2020-08-23T09:00:00+02:00\",\n \"auto_checked_in\": false,\n \"gate\": null,\n \"device\": 1,\n \"device_id\": 1,\n \"type\": \"entry\"\n}\n\n\n\nAn unauthorized user usually has no way to match these IDs (position) back to individual people.",
"id": "PYSEC-2026-111",
"modified": "2026-05-20T09:19:11.663445Z",
"published": "2026-04-08T13:16:43.543Z",
"references": [
{
"type": "ADVISORY",
"url": "https://pretix.eu/about/en/blog/20260408-release-2026-3-1/"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-wr8q-c73g-m7gp"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.