High severity · published Mar 27, 2026
CVE-2026-34391
Fleet Vulnerable to Windows MDM cross-device command disclosure
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
fleet · fleetdm
< 4.81.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34391
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34391
Vendor Advisory
https://github.com/fleetdm/fleet/security/advisories/GHSA-wg7j-pcc3-h4rh
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