# CVE-2026-22808: GO-2026-4336 - Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability in github.com/fleetdm/fleet

Source: https://junglewise.ai/threats/cve-2026-22808-fleet-windows-mdm-endpoint-has-a-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-03  
License: CC BY 4.0 with a link back

CVE-2026-22808 · Severity: medium · CVSS 4 · Published 2026-02-03

Fleet Windows MDM endpoint has a Cross-site Scripting vulnerability in github.com/fleetdm/fleet

Technologies: [github.com/fleetdm/fleet (Go)](https://junglewise.ai/threats/technologies/github-com-fleetdm-fleet), [github.com/fleetdm/fleet/v4 (Go)](https://junglewise.ai/threats/technologies/github-com-fleetdm-fleet-v4). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-22808 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-22808 being exploited in the wild.

**How severe is CVE-2026-22808?** Medium severity, with a CVSS score of 4, published 3 February 2026.

**Which products and versions are affected?** github.com/fleetdm/fleet (Go) SEMVER:introduced=4.78.0,fixed=4.78.2; github.com/fleetdm/fleet/v4 (Go) SEMVER:introduced=0,fixed=4.43.5-0.20260111020427-0e6c790803d1, SEMVER:introduced=4.75.0,fixed=4.75.2,introduced=4.76.0,fixed=4.76.2,introduced=4.77.0,fixed=4.77.1,introduced=4.78.0,fixed=4.78.2.

**Is there a fix for CVE-2026-22808?** Yes. github.com/fleetdm/fleet (Go): upgrade to 4.78.2 or later; github.com/fleetdm/fleet/v4 (Go): upgrade to 4.43.5-0.20260111020427-0e6c790803d1, 4.78.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-22808?** Check whether you run github.com/fleetdm/fleet (Go) or github.com/fleetdm/fleet/v4 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/fleetdm/fleet (Go): upgrade to 4.78.2 or later

  ```sh
  go get github.com/fleetdm/fleet@v4.78.2
  ```

- github.com/fleetdm/fleet/v4 (Go): upgrade to 4.43.5-0.20260111020427-0e6c790803d1, 4.78.2 or later

  ```sh
  go get github.com/fleetdm/fleet/v4@v4.78.2
  ```


## Affected products

- github.com/fleetdm/fleet (Go) SEMVER:introduced=4.78.0,fixed=4.78.2
- github.com/fleetdm/fleet/v4 (Go) SEMVER:introduced=0,fixed=4.43.5-0.20260111020427-0e6c790803d1, SEMVER:introduced=4.75.0,fixed=4.75.2,introduced=4.76.0,fixed=4.76.2,introduced=4.77.0,fixed=4.77.1,introduced=4.78.0,fixed=4.78.2

## Identifiers

- CVE-2026-22808
- GHSA-gfpw-jgvr-cw4j
- GO-2026-4336

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- [Fleet DM cross-team policy data exposure in global policy endpoint](https://junglewise.ai/threats/cve-2026-41262-fleet-dm-cross-team-policy-data-exposure-in-global-policy)