CVE-2026-34389

Fleet's user account creation via invite does not enforce invited email address

CVSS 4.9 MEDIUMEPSS 0.2%CWE-287

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

27 Mar 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Fleet is open source device management software. Prior to 4.81.0, Fleet contained an issue in the user invitation flow where the email address provided during invite acceptance was not validated against the email address associated with the invite. 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. Version 4.81.0 patches the issue.

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

Affected products

fleetdm · fleet

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

https://github.com/fleetdm/fleet/security/advisories/GHSA-4f9r-x588-pp2h