CVE-2026-5600 json
pretix: API leaks check-in data between events of the same organizer
published 2026-04-08 7 mo ago modified 2026-07-24 3 mo ago also GHSA-wr8q-c73g-m7gp , PYSEC-2026-111 , EUVD-2026-20463
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi pretix 2026.1.2, 2026.2.1, 2026.3.1
- pretix pretix 2026.1.2, 2026.2.1, 2026.3.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.5 | CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H |
| CNA | 4.0 | 5.5 | CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pretix | >=2026.3.0, <2026.3.1 >=2026.2.0, <2026.2.1 >=2025.10.0, <2026.1.2 |
2026.3.1 2026.2.1 2026.1.2 |
Affected products
- pretix pretix
Classification
- Weakness
-
- CWE-653 Improper Isolation or Compartmentalization
References
-
pretix.eu
/about/en/blog/20260408-release-2026-3-1/
vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-5600
advisory
-
github.com
/pretix/pretix
package
-
github.com
/pypa/advisory-database/tree/main/vulns/pretix/PYSEC-2026-111.yaml
web
-
pretix.eu
/about/en/blog/20260408-release-2026-3-1
web
-
github.com
/advisories/GHSA-wr8q-c73g-m7gp
advisory
Sources
- CVE List CVE-2026-5600
- GitHub Advisory GHSA-wr8q-c73g-m7gp
- NVD CVE-2026-5600
- OSV PYSEC-2026-111
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.