# CVE-2026-3514: Authentication Bypass in prefecthq/prefect

> CVE-2026-3514: Authentication Bypass in prefecthq/prefect. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-3514
Last updated: 2026-07-22T19:10:00Z

- Published: 2026-06-02 07:28 UTC · Updated: 2026-07-22 19:10 UTC · Assigner: @huntr\_ai
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS: 0.48%, 41th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

In version 3.6.19 of prefecthq/prefect, an authentication bypass vulnerability exists due to the improper handling of URL path exemptions for health check probes. Specifically, the authentication middleware exempts any URL path ending with 'health' or 'ready' from authentication checks. This allows an attacker to create resources with names ending in 'health' or 'ready' and access them without authentication. Affected endpoints include those for variables, flows, work pools, work queues, and deployments. This vulnerability can lead to unauthorized access to sensitive information, such as API keys and database credentials, stored in Prefect Variables.

## Affected vendors and products

- prefecthq: prefecthq/prefect

## Tracked companies

- [Prefect](https://rewindex.com/company/prefect.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-3514)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-3514)
- [https://github.com/prefecthq/prefect/commit/e21617125335025b4b27e7d6f0ca028e8e8f3b79](https://github.com/prefecthq/prefect/commit/e21617125335025b4b27e7d6f0ca028e8e8f3b79)
- [https://huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75](https://huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-3514 · Markdown: https://rewindex.com/cve/CVE-2026-3514.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-3514 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:29.628Z