CVE-2026-34389: Fleet is open source device management software

Q: How do I fix CVE-2026-34389?

fleet: upgrade to 4.81.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-34389 being exploited?

CVE-2026-34389 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34389 affect?

CVE-2026-34389 affects fleet. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-34389?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-34389 is a medium-severity flaw (CVSS 6.5) affecting fleet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 th

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: fleetdm

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

fleetdm fleet UPGRADE

Affected: < 4.81.1

Fixed in: 4.81.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fleet || rpm -q fleet || fleet --version

2. UPGRADE to 4.81.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fleet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fleet

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34389?

fleet: upgrade to 4.81.1. Exact commands for each OS are on this page.

Is CVE-2026-34389 being exploited?

CVE-2026-34389 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34389 affect?

CVE-2026-34389 affects fleet. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-34389?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-34387 CRITICAL 9.8 UPGRADE Fleet is open source device management software
CVE-2026-29180 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34386 HIGH 8.8 UPGRADE Fleet is open source device management software
CVE-2026-34391 HIGH 7.5 UPGRADE Fleet is open source device management software
CVE-2026-34385 HIGH 8.1 UPGRADE Fleet is open source device management software

References

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