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.

No CVSS v4.0

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
prefecthq prefecthq/prefect affected
Version Status Constraints
unspecified affected < 3.6.22

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/prefecthq/prefect/commit/e21617125335025b4b27e7d6f0ca028e8e8f3b79 cve-icon cve-icon
https://huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75 cve-icon cve-icon
History

Tue, 02 Jun 2026 08:30:00 +0000

Type Values Removed Values Added
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.
Title Authentication Bypass in prefecthq/prefect
Weaknesses CWE-863
References
Metrics cvssV3_0

{'score': 7.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2026-06-02T07:28:33.260Z

Reserved: 2026-03-04T15:03:15.653Z

Link: CVE-2026-3514

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-02T09:16:16.100

Modified: 2026-06-02T09:16:16.100

Link: CVE-2026-3514

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-02T09:30:05Z

Weaknesses