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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.

PUBLISHED Reserved 2026-03-04 | Published 2026-06-02 | Updated 2026-06-02 | Assigner @huntr_ai




HIGH: 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem types

CWE-863 Incorrect Authorization

Product status

Any version before 3.6.22
affected

References

huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75 exploit

huntr.com/bounties/c540e5e1-f74f-44f4-bfa0-9764ff6daa75

github.com/...ommit/e21617125335025b4b27e7d6f0ca028e8e8f3b79

cve.org (CVE-2026-3514)

nvd.nist.gov (CVE-2026-3514)

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