CVE-2026-3514

Authentication Bypass in prefecthq/prefect

Published Jun 2, 2026 CVSS 3.0 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-c635-393c-hcx2 Prefect has an Authentication Middleware Bypass when URL paths are appended with 'health' or 'ready'
History
Type Values Removed Values Added
First Time appeared Prefect
Prefect prefect
CPEs cpe:2.3:a:prefect:prefect:*:*:*:*:*:*:*:*
Vendors & Products Prefect
Prefect prefect
Type Values Removed Values Added
First Time appeared Prefecthq
Prefecthq prefecthq/prefect
Vendors & Products Prefecthq
Prefecthq prefecthq/prefect
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
@huntr_ai
Published
Updated
Jun 2, 2026, 1:13 PM
Reserved
Mar 4, 2026, 3:03 PM
Status
Analyzed
Published
Jun 2, 2026, 9:16 AM
Modified
Jul 22, 2026, 7:10 PM