fleetdm/fleet is open source device management software. Prior to versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, if Windows MDM is enabled, an unauthenticated attacker can exploit this XSS vulnerability to steal a Fleet administrator's authentication token (FLEET::auth_token) from localStorage. This could allow unauthorized access to Fleet, including administrative access, visibility into device data, and modification of configuration. Versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-gfpw-jgvr-cw4j Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 23 Jan 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Fleetdm
Fleetdm fleet
Vendors & Products Fleetdm
Fleetdm fleet

Thu, 22 Jan 2026 23:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 21 Jan 2026 21:30:00 +0000

Type Values Removed Values Added
Description fleetdm/fleet is open source device management software. Prior to versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, if Windows MDM is enabled, an unauthenticated attacker can exploit this XSS vulnerability to steal a Fleet administrator's authentication token (FLEET::auth_token) from localStorage. This could allow unauthorized access to Fleet, including administrative access, visibility into device data, and modification of configuration. Versions 4.78.2, 4.77.1, 4.76.2, 4.75.2, and 4.53.3 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.
Title Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 5.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-22T16:50:28.717Z

Reserved: 2026-01-09T22:50:10.288Z

Link: CVE-2026-22808

cve-icon Vulnrichment

Updated: 2026-01-22T15:09:39.255Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-21T22:15:49.233

Modified: 2026-01-26T15:04:59.737

Link: CVE-2026-22808

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-22T10:08:27Z

Weaknesses