What is CVE-2026-34391?

CVE-2026-34391 is a high-severity vulnerability in Fleetdm Fleet, classified under CWE-488. CVSS score: 7.5/10. Published 2026-03-27.

How severe is CVE-2026-34391?

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

Vulnerability in Fleetdm Fleet

CVE-2026-34391

Fleet is open source device management software. Prior to 4.81.1, a vulnerability in Fleet's Windows MDM command processing allows a malicious enrolled device to access MDM commands intended for other devices, potentially exposing sensitive configuration data such as WiFi credentials, VPN secrets, and certificate payloads across the entire Windows fleet. Version 4.81.1 patches the issue.

EPSS: 0.002 (5.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Fleetdm Fleet — versions < 4.81.1

Weakness classification (CWE)

CWE-488

References

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

Frequently asked questions

What is CVE-2026-34391?: CVE-2026-34391 is a high-severity vulnerability in Fleetdm Fleet, classified under CWE-488. CVSS score: 7.5/10. Published 2026-03-27.
How severe is CVE-2026-34391?: High severity. CVSS v3 base score is 7.5 out of 10.