CVE-2026-3514 HIGH

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

Vendor Prefecthq
Product prefecthq/prefect
Weakness CWE-863 · Incorrect authorization
Published June 2, 2026
Last update June 2, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 2, 2026 CVE published
June 2, 2026 Record updated