Vulnerability · Published Mar 27, 2026 · Assigned by GitHub_M
CVE-2026-34389Fleet's user account creation via invite does not enforce invited email address
Medium 4.9
In plain English
A medium-severity improper authentication in fleet from fleetdm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/fleetdm/fleet/v4 | 4.81.0 | GO-2026-4912 |
| Go | github.com/fleetdm/fleet/v4 | 4.81.0 | GHSA-4f9r-x588-pp2h |
Affected products (as reported)
Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
References
- https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h x_refsource_CONFIRM