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EUVD-2026-46078

2026-10-10T18:27:48.352622+00:00

EUVD-2026-46078

fkie_cve-2020-26276

2026-10-10T18:27:48.352669+00:00

Fleet is an open source osquery manager. In Fleet before version 3.5.1, due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP. Users that configure Fleet with SSO login may be vulnerable to this issue. This issue is patched in 3.5.1. The fix was made using https://github.com/mattermost/xml-roundtrip-validator If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.

GHSA-w3wf-cfx3-6gcx — SAML authentication vulnerability due to stdlib XML parsing

2026-10-10T18:27:48.352741+00:00

Affected: Go: github.com/fleetdm/fleet/v4

### Impact Due to issues in Go's standard library XML parsing, a valid SAML response may be mutated by an attacker to modify the trusted document. This can result in allowing unverified logins from a SAML IdP.

Users that configure Fleet with SSO login may be vulnerable to this issue.

### Patches This issue is patched in 3.5.1 using https://github.com/mattermost/xml-roundtrip-validator.

### Workarounds If upgrade to 3.5.1 is not possible, users should disable SSO authentication in Fleet.

### References See https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ for more information about the underlying vulnerabilities.

### For more information If you have any questions or comments about this advisory: * Email us at [security@fleetdm.com](mailto:security@fleetdm.com) * Join #fleet in [osquery Slack](https://join.slack.com/t/osquery/shared_invite/zt-h29zm0gk-s2DBtGUTW4CFel0f0IjTEw)

gsd-2020-26276

2026-10-10T18:27:48.352776+00:00

gsd-2020-26276