Review reviewHigh

CVE-2026-3514

prefecthq prefecthq/prefect, prefect

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 AP...

CVSS: 7.5
EPSS: 0.48%
CISA KEV: Not listed
Published: 2026.06.02

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.48%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: prefecthq prefecthq/prefect, prefect
Affected versions: >= unspecified < 3.6.22, < 3.6.22
Fixed versions: 3.6.22

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that prefecthq prefecthq/prefect, prefect and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE: CWE-863