CVE-2026-9712: Pretix Pretix Vulnerable To Authorization Bypass Vulnerability

LOW
Advisory Identifier: GHSA-72p9-6vv6-gvqh
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CWE-639
Published
Advisory Summary

CVE-2026-9712 is a LOW pretix vulnerable to authorization bypass vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Pretix libraries in the PyPI ecosystem. The issue involves pretix vulnerable to authorization bypass through user-controlled key. Remediation is available by upgrading affected packages to version 2026.4.2.

CVE-2026-9712 at a Glance

CVE Identifier CVE-2026-9712
GHSA Identifier GHSA-72p9-6vv6-gvqh
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product Pretix
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-9712

To remediate this vulnerability, upgrade all affected Pretix dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pretix fixed: 2026.4.2 
pip install pretix>=2026.4.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show pretix

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-9712, inspect your installed packages using pip:

pip show pretix

Analyze the terminal output to locate any version of Pretix in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2026.4.2), your application is affected.

Note: The pip show pretix command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Pretix, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

When creating an export through the pretix API, API clients are returned an UUID value for their export job (a long, random string like 35742818-c375-4d15-839f-d49aecce94d6). Using this UUID, the API client can then request the actual file for download. The same kind of UUID is used in other places in pretix when temporary files are generated for internal use or download. One remaining API endpoint, however, wrongfully did not verify if the UUID used for download actually belongs to a file that is supposed to be downloadable and belongs to the correct user. In reality, this is hard to exploit because an attacker would need to have access to a valid UUID for the file they desire which is unlikely to happen without a separate security problem giving them access to logs etc.

CVE-2026-9712 Affected Pretix Versions

1 component(s)
Fixed Versions:
2026.4.2
Product / Package Ecosystem Affected Versions Fixed Version
pretix
pypi/pretix
PyPI
< 2026.4.2
2026.4.2

References

NVD — CVE-2026-9712 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9712
Pretix Source Repository REPOSITORY
https://github.com/pretix/pretix
Pretix Release RELEASE
https://pretix.eu/about/en/blog/20260527-release-2026-4-2

Frequently Asked Questions

What is CVE-2026-9712?
CVE-2026-9712 is a security vulnerability in Pretix involving pretix vulnerable to Authorization Bypass Through User-Controlled Key under CWE-639: Authorization Bypass Through User-Controlled Key.
Which Pretix versions are affected?
Affected versions include releases prior to 2026.4.2 across affected packages: pretix.
What version fixes CVE-2026-9712?
Upgrading to 2026.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pretix affected?
Yes, pretix is affected in releases prior to 2026.4.2. Upgrade your dependency to 2026.4.2 or later.
What CWE is associated with CVE-2026-9712?
CVE-2026-9712 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check PyPI dependencies for CVE-2026-9712?
Run the dependency tree command: 'pip show pretix'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-72p9-6vv6-gvqh",
  "modified" : "2026-07-01T19:47:20Z",
  "published" : "2026-05-27T15:33:28Z",
  "aliases" : [ "CVE-2026-9712" ],
  "summary" : "pretix vulnerable to Authorization Bypass Through User-Controlled Key",
  "details" : "When creating an export through the pretix API, API clients are returned an UUID value for their export job (a long, random string like 35742818-c375-4d15-839f-d49aecce94d6). Using this UUID, the API client can then request the actual file for download. The same kind of UUID is used in other places in pretix when temporary files are generated for internal use or download.\n\nOne remaining API endpoint, however, wrongfully did not verify if the UUID used for download actually belongs to a file that is supposed to be downloadable and belongs to the correct user. In reality, this is hard to exploit because an attacker would need to have access to a valid UUID for the file they desire which is unlikely to happen without a separate security problem giving them access to logs etc.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pretix"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2026.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9712"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pretix/pretix"
  }, {
    "type" : "WEB",
    "url" : "https://pretix.eu/about/en/blog/20260527-release-2026-4-2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T19:47:20Z",
    "nvd_published_at" : "2026-05-27T15:16:36Z"
  }
}