Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/fleetdm/fleetGo | >= 4.78.0, < 4.78.2 | 4.78.2 |
github.com/fleetdm/fleetGo | >= 4.77.0, < 4.77.1 | 4.77.1 |
github.com/fleetdm/fleetGo | >= 4.76.0, < 4.76.2 | 4.76.2 |
github.com/fleetdm/fleetGo | >= 4.75.0, < 4.75.2 | 4.75.2 |
github.com/fleetdm/fleet/v4Go | < 4.43.5-0.20260111020427-0e6c790803d1 | 4.43.5-0.20260111020427-0e6c790803d1 |
Affected products
4- ghsa-coords3 versionspkg:golang/github.com/fleetdm/fleetpkg:golang/github.com/fleetdm/fleet/v4pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6
>= 4.78.0, < 4.78.2+ 2 more
- (no CPE)range: >= 4.78.0, < 4.78.2
- (no CPE)range: < 4.43.5-0.20260111020427-0e6c790803d1
- (no CPE)range: < 0.0.20260205T172317-150000.1.146.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-gfpw-jgvr-cw4jghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-22808ghsaADVISORY
- github.com/fleetdm/fleet/commit/0e6c790803d1b4407c5b4b41a67a37864a3d3573ghsaWEB
- github.com/fleetdm/fleet/security/advisories/GHSA-gfpw-jgvr-cw4jghsax_refsource_CONFIRMWEB
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