What is CVE-2026-3514?

CVE-2026-3514 is a high-severity vulnerability in Prefect, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-06-02.

How severe is CVE-2026-3514?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Prefect

CVE-2026-3514

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…

Vulnerability class: Broken Access Control

EPSS: 0.001 (23.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Prefect
Prefecthq Prefecthq/prefect — versions unspecified

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@huntr.dev (Exploit, Third Party Advisory)
security@huntr.dev (Patch)

Frequently asked questions

What is CVE-2026-3514?: CVE-2026-3514 is a high-severity vulnerability in Prefect, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-06-02.
How severe is CVE-2026-3514?: High severity. CVSS v3 base score is 7.5 out of 10.