CVE-2026-34389 Details
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.
A vulnerability in Fleet's user invitation process prior to version 4.81.0 allowed for the creation of accounts under arbitrary email addresses. This issue arose because the email provided during invite acceptance was not validated against the one associated with the invite. An attacker with a valid invite token could exploit this flaw, creating an account with the desired email while inheriting the role granted by the invite, including global admin rights.
Users are advised to upgrade to Fleet version 4.81.0 or later. If an immediate upgrade is not possible, treat invite links as sensitive credentials, avoid sharing them in public or semi-public channels, and revoke and reissue invites if there is concern that an invite link may have been exposed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| fleetdm fleet | < 4.81.1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 2, 2026 | Initial Analysis | [email protected] |
| Mar 27, 2026 | New CVE Received | [email protected] |