CVE-2026-22808 (GCVE-0-2026-22808)

Vulnerability from cvelistv5 – Published: 2026-01-21 21:18 – Updated: 2026-01-22 16:50
VLAI
Title
Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability
Summary
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.
Severity
5.5 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 15:09 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
fleetdm fleet Affected: >= 4.78.0, < 4.78.2
Affected: >= 4.77.0, < 4.77.1
Affected: >= 4.76.0, < 4.76.2
Affected: < 4.53.3
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