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An attacker who obtained a valid invite token could create an account under an arbitrary email address while inheriting the role granted by the invite, including global admin.\n\n### Impact\n\nIf an attacker gains access to a valid invite token, they can create a Fleet user account with an email address of their choosing while inheriting the invite’s assigned role and team memberships.\n\nThis issue:\n\n- Requires possession of a valid invite token\n- Does not bypass authentication controls beyond invite-based account creation\n- Does not expose data without successful account creation\n\n### Workarounds\n\nIf upgrading immediately is not possible:\n\n- Treat invite links as sensitive credentials and avoid sharing them in public or semi-public channels (e.g., Slack, Teams).\n- Revoke and reissue invites if there is any concern that an invite link may have been exposed.\n- Prefer issuing invites with the minimum required privileges and elevating roles after account creation when appropriate.\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n\nSend an email to [security@fleetdm.com](mailto:security@fleetdm.com)\n\n### Credits\n\nFleet thanks @fuzzztf for responsibly reporting this issue.","state":0,"publishedAt":"2026-03-30T19:29:13+00:00","modifiedAt":"2026-04-02T21:26:23.8292759+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h","https://nvd.nist.gov/vuln/detail/CVE-2026-34389","https://github.com/fleetdm/fleet"],"sourceUrl":"https://github.com/advisories/GHSA-4f9r-x588-pp2h","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4f9r-x588-pp2h","identifiers":["GHSA-4f9r-x588-pp2h","CVE-2026-34389","GO-2026-4912"]},"retained":false,"historicalAffected":[]},{"revision":"83b43fce6f7945aca772a90bf62cefa5","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4912","aliases":["CVE-2026-34389","GHSA-4f9r-x588-pp2h"],"title":"Fleet's user account creation via invite does not enforce invited email address in github.com/fleetdm/fleet","description":"Fleet's user account creation via invite does not enforce invited email address in github.com/fleetdm/fleet","state":0,"publishedAt":"2026-04-02T18:42:30+00:00","modifiedAt":"2026-04-02T21:20:08.632482+00:00","affected":[{"ecosystem":"Go","name":"github.com/fleetdm/fleet/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.81.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h","https://nvd.nist.gov/vuln/detail/CVE-2026-34389"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4912","license":"OSV · upstream source license applies","key":"osv:GO-2026-4912","identifiers":["GO-2026-4912","CVE-2026-34389","GHSA-4f9r-x588-pp2h"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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