CVE-2026-34389
Medium
Description
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 the invite. An attacker who obtained a valid invite token could create an account under an arbitrary email address while inheriting the role granted by the invite, including global admin. Version 4.81.0 patches the issue.
SeverityMedium
CVSS6.5
Exploit probability—
ProductFleet
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- fleetdm fleet4.81.1 or later
- github.com/fleetdm/fleet/v44.81.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| fleetdm fleet | v < 4.81.1 | 4.81.1 |
| github.com/fleetdm/fleet/v4Go | v < 4.81.0 | 4.81.0 |
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