What is CVE-2026-34389?

CVE-2026-34389 is a medium-severity vulnerability in Fleetdm Fleet, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-03-27.

How severe is CVE-2026-34389?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Fleetdm Fleet

CVE-2026-34389

Fleet is open source device management software. Prior to 4.81.0, Fleet contained an issue in the user invitation flow where the email address provided during invite acceptance was not validated against the email address associated with th…

Vulnerability class: Broken Authentication

EPSS: 0.002 (8.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Fleetdm Fleet — versions < 4.81.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34389?: CVE-2026-34389 is a medium-severity vulnerability in Fleetdm Fleet, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-03-27.
How severe is CVE-2026-34389?: Medium severity. CVSS v3 base score is 6.5 out of 10.