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CVE PROGRAM SOURCE RECORD5.5 Medium

CVE-2026-22808

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

fleetdm fleet

  • >= 4.78.0, < 4.78.2affected
  • >= 4.77.0, < 4.77.1affected
  • >= 4.76.0, < 4.76.2affected
  • < 4.53.3affected

References