CVE-2026-29180: Github.com/fleetdm/fleet/v4 Remote Code Execution Vulnerability
MODERATECVE-2026-29180 is a MODERATE remote code execution vulnerability (CWE-862: Missing Authorization) affecting Github.com/fleetdm/fleet/v4 libraries in the Go ecosystem. The issue involves a fleet team maintainer can transfer hosts from any team via missing source team authorization. Remediation is available by upgrading affected packages to version 4.81.1.
CVE-2026-29180 at a Glance
How to Fix CVE-2026-29180
To remediate this vulnerability, upgrade all affected Github.com/fleetdm/fleet/v4 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/fleetdm/fleet/v4 to 4.81.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/fleetdm/fleet/v4How to Check if You Are Affected
To determine whether your application is affected by CVE-2026-29180, inspect your project dependencies for Github.com/fleetdm/fleet/v4:
inspect dependencies for github.com/fleetdm/fleet/v4Analyze the terminal output to locate any version of Github.com/fleetdm/fleet/v4 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.81.1), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Github.com/fleetdm/fleet/v4, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-29180 Affected Github.com/fleetdm/fleet/v4 Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/fleetdm/fleet/v4
|
Go |
< 4.81.1
|
4.81.1
|
References
Frequently Asked Questions
What is CVE-2026-29180?
Which Github.com/fleetdm/fleet/v4 versions are affected?
What version fixes CVE-2026-29180?
Is github.com/fleetdm/fleet/v4 affected?
What CWE is associated with CVE-2026-29180?
How can I check Go dependencies for CVE-2026-29180?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-m2h6-4xpq-qw3m",
"modified" : "2026-03-27T21:47:58Z",
"published" : "2026-03-27T20:24:19Z",
"aliases" : [ "CVE-2026-29180" ],
"summary" : "A Fleet team maintainer can transfer hosts from any team via missing source team authorization",
"details" : "### Summary\n\nA broken access control vulnerability in Fleet's host transfer API allows a team maintainer to transfer hosts from any team into their own team, bypassing team isolation boundaries. Once transferred, the attacker gains full control over the stolen hosts, including the ability to execute scripts with root privileges.\n\n### Impact\n\nThe host transfer endpoints verify that the caller has write permission to the destination team but do not check whether the caller has any permission over the source team of the hosts being transferred.\n\nOnce hosts are transferred, the attacker's team MDM configuration is automatically applied to the stolen devices, and the attacker can execute scripts on them with root privileges. In multi-tenant Fleet deployments where teams represent business units, departments, or customers, this breaks all team isolation guarantees. A bulk transfer variant allows stealing all matching hosts fleet-wide in a single request.\n\nExploitation requires authentication as a team maintainer or team admin.\n\n### Workarounds\n\nThere is no workaround for this issue short of upgrading to a patched version. Organizations concerned about exploitation should audit host transfer activity in their Fleet logs for any unexpected team reassignments.\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n\nEmail Fleet at [security@fleetdm.com](mailto:security@fleetdm.com)\nJoin #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)\n\n### Credits\n\nFleet thanks @secfox-ai for responsibly reporting this issue.",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/fleetdm/fleet/v4"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "4.81.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/fleetdm/fleet/security/advisories/GHSA-m2h6-4xpq-qw3m"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-29180"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/fleetdm/fleet"
}, {
"type" : "WEB",
"url" : "https://github.com/fleetdm/fleet/releases/tag/fleet-v4.81.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-862" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-27T20:24:19Z",
"nvd_published_at" : "2026-03-27T19:16:42Z"
}
}