Exposure of Data Element to Wrong Session Affecting github.com/fleetdm/fleet/server/mdm/microsoft package, versions <4.81.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMFLEETDMFLEETSERVERMDMMICROSOFT-15874136
- published2 Apr 2026
- disclosed27 Mar 2026
- creditfuzzztf
Introduced: 27 Mar 2026
CVE-2026-34391 Â (opens in a new tab)How to fix?
Upgrade github.com/fleetdm/fleet/server/mdm/microsoft to version 4.81.1 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Data Element to Wrong Session in the MDM command processing while handling SyncML status code. An attacker can obtain sensitive configuration data belonging to other devices (such as WiFi credentials, VPN secrets, and certificate payloads) by enrolling a malicious device and exploiting improper isolation of MDM commands.
Note:
Exploitation requires a device enrolled in Fleet's Windows MDM.