Missing Authentication for Critical Function Affecting prefect package, versions [,3.6.14.dev5)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-PREFECT-16379909
- published4 May 2026
- disclosed4 May 2026
- creditnedlir
Introduced: 4 May 2026
NewCVE-2026-7723 (opens in a new tab)How to fix?
Upgrade prefect to version 3.6.14.dev5 or higher.
Overview
prefect is a Prefect is a new workflow management system, designed for modern infrastructure and powered by the open-source Prefect Core workflow engine. Users organize Tasks into Flows, and Prefect takes care of the rest.
Affected versions of this package are vulnerable to Missing Authentication for Critical Function at the /api/events/in endpoint. An attacker can send JSON events into an existing stream, which can at least pollute the stream and at worst trigger automations if they know the details of a given target's subscription. This is possible without authentication, even when PREFECT_SERVER_API_AUTH_STRING is set, because subscriptions.accept_prefect_socket() is never applied before allowing a connection on the vulnerable endpoint.