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.

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History

Wed, 03 Jun 2026 17:15:00 +0000

Type Values Removed Values Added
First Time appeared Prefect
Prefect prefect
CPEs cpe:2.3:a:prefect:prefect:*:*:*:*:*:*:*:*
Vendors & Products Prefect
Prefect prefect

Wed, 03 Jun 2026 02:30:00 +0000

Type Values Removed Values Added
First Time appeared Prefecthq
Prefecthq prefecthq/prefect
Vendors & Products Prefecthq
Prefecthq prefecthq/prefect

Tue, 02 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2026-06-02T13:13:11.889Z

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

Link: CVE-2026-3514

cve-icon Vulnrichment

Updated: 2026-06-02T13:12:02.871Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-06-03T17:08:35.163

Link: CVE-2026-3514

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-02T20:52:10Z

Weaknesses