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CVE-2026-34389— Fleet's user account creation via invite does not enforce invited email address

Quick assessment

Affected
fleetdm fleet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.0之前版本存在授权问题漏洞，该漏洞源于用户邀请流程中未验证电子邮件地址，可能导致攻击者创建任意账户并继承权限。

AI Predicted 8.1 Difficulty: Easy EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2026-34389

Vulnerability Information
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Vulnerability Title
Fleet's user account creation via invite does not enforce invited email address
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Fleet 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fleet是Fleet Device Management开源的一个设备管理平台，支持多种操作系统和设备，帮助 IT 和安全团队进行设备管理、漏洞报告、MDM 等操作。 Fleet 4.81.0之前版本存在授权问题漏洞，该漏洞源于用户邀请流程中未验证电子邮件地址，可能导致攻击者创建任意账户并继承权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fleetdm fleet < 4.81.0 -

II. Public POCs for CVE-2026-34389

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III. Intelligence Information for CVE-2026-34389

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Vendor Advisories for CVE-2026-34389 (1)

Same Patch Batch · fleetdm · 2026-03-27 · 9 CVEs total

CVE-2026-26061 Fleet's unbounded request body read allows remote Denial of Service
CVE-2026-26060 Fleet: Password reset tokens remain valid after password change for 24 hours
CVE-2026-29180 Fleet's team maintainer can transfer hosts from any team via missing source team authoriza
CVE-2026-34386 Fleet vulnerable to SQL injection in MDM bootstrap package by authenticated team or globa
CVE-2026-34385 Fleet's Apple MDM profile delivery has second-order SQL injection that can compromise the
CVE-2026-34387 Fleet vulnerable to OS command injection via crafted software package metadata in uninstal
CVE-2026-34388 Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint
CVE-2026-34391 Fleet Vulnerable to Windows MDM cross-device command disclosure

IV. Related Vulnerabilities

Same product: fleet
Same vendor: fleetdm
Same weakness: CWE-287

V. Comments for CVE-2026-34389

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