GHSA-ffg9-j72f-j6xm

Source

https://github.com/advisories/GHSA-ffg9-j72f-j6xm

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffg9-j72f-j6xm/GHSA-ffg9-j72f-j6xm.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-ffg9-j72f-j6xm

Aliases

Published

2026-05-14T13:13:56Z

Modified

2026-06-25T19:56:02Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Fleet Windows MDM Azure AD JWT Authentication Bypass

Details

Summary

A vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the aud (audience) or iss (issuer) claims, any Microsoft-signed Azure AD access token containing the expected scopes can be used to authenticate to Fleet's MDM endpoints.

Impact

If Windows MDM is enabled, an attacker with access to any Azure AD tenant can obtain a valid Microsoft-signed token and use it to enroll unauthorized devices and interact with Fleet's MDM management APIs. During device management, Fleet may expose sensitive enrollment secrets embedded in MDM command payloads, enabling further unauthorized access.

Workarounds

If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.

For more information

If you have any questions or comments about this advisory: Email us at security@fleetdm.com Join #fleet in osquery Slack

Credits

We thank @zaddy6 for responsibly reporting this issue.

Database specific

{
    "cwe_ids":  [
        "CWE-290"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-14T13:13:56Z",
    "nvd_published_at":  "2026-05-14T20:17:01Z",
    "severity":  "HIGH"
}

References

Affected packages

Go / github.com/fleetdm/fleet/v4

Package

Name: github.com/fleetdm/fleet/v4; View open source insights on deps.dev
Purl: pkg:golang/github.com/fleetdm/fleet/v4

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

4.82.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-ffg9-j72f-j6xm/GHSA-ffg9-j72f-j6xm.json"