Prefect Unauthenticated Event Injection via /api/events/in WebSocket
A flaw has been found in PrefectHQ prefect up to 3.6.13. Affected is an unknown function of the file /api/events/in of the component WebSocket Endpoint. Executing a manipulation can lead to missing authentication. The attack may be performed from remote. The exploit has been published and may be used. Upgrading to version 3.6.14 is able to address this issue. This patch is called 0d3ab3c2d3f9f98abfafdf7b9f6d4f8ed3925e40. It is recommended to upgrade the affected component.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | prefect | < 3.6.14 | 3.6.14 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-7723
- https://github.com/PrefectHQ/prefect/pull/20372
- https://github.com/PrefectHQ/prefect/commit/0d3ab3c2d3f9f98abfafdf7b9f6d4f8ed3925e40
- https://github.com/PrefectHQ/prefect/commit/f8afecadf88ea5f73694dafa3a365b9d8fae1ad6
- https://gist.github.com/nedlir/f1ab8aa038aafbcc6beeef21fab1d74f
- https://github.com/PrefectHQ/prefect
- https://github.com/PrefectHQ/prefect/releases/tag/3.6.14
- https://vuldb.com/submit/807256
- https://vuldb.com/vuln/360899
- https://vuldb.com/vuln/360899/cti
- https://pypi.org/project/prefect
- https://github.com/advisories/GHSA-hvph-5985-r63v
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-287- Platform
- Python (PyPI)
- Package
prefect- Disclosed
- 04.05.2026
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2958 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-hvph-5985-r63v - CC BY 4.0
Vulnerability history: prefect
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 11.2023 06.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 2
- Low 2
Disclosures per year
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 6
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Prefect Unauthenticated Event Injection via /api/events/in WebSocket this entry
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