Medium severity · published Jan 21, 2026
CVE-2026-22808
Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FL
fleet · fleetdm
>= 4.78.0, < 4.78.2; >= 4.77.0, < 4.77.1; >= 4.76.0, < 4.76.2; < 4.53.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-22808
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-22808
Vendor Advisory
https://github.com/fleetdm/fleet/security/advisories/GHSA-gfpw-jgvr-cw4j
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