CVSS 4.0
5.5 mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:HCVE-2026-22808
Medium (5.5) in fleetdm fleet. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/fleetdm/fleet 4.75.2, 4.76.2, 4.77.1.
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
CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- fleetdm:fleet
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-gfpw-jgvr-cw4j | Go | github.com/fleetdm/fleet | >=4.78.0 <4.78.2 | 4.78.2 |
| GHSA-gfpw-jgvr-cw4j | Go | github.com/fleetdm/fleet | >=4.77.0 <4.77.1 | 4.77.1 |
| GHSA-gfpw-jgvr-cw4j | Go | github.com/fleetdm/fleet | >=4.76.0 <4.76.2 | 4.76.2 |
| GHSA-gfpw-jgvr-cw4j | Go | github.com/fleetdm/fleet | >=4.75.0 <4.75.2 | 4.75.2 |
| GHSA-gfpw-jgvr-cw4j | Go | github.com/fleetdm/fleet/v4 | <4.43.5-0.20260111020427-0e6c790803d1 | 4.43.5-0.20260111020427-0e6c790803d1 |
| GO-2026-4336 | Go | github.com/fleetdm/fleet/v4 | >=4.75.0 <4.75.2 >=4.76.0 <4.76.2 >=4.77.0 <4.77.1 >=4.78.0 <4.78.2 | 4.75.2, 4.76.2, 4.77.1, 4.78.2 |