What is CVE-2026-23998?

CVE-2026-23998 is a high-severity vulnerability in Fleetdm Fleet, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-05-14.

How severe is CVE-2026-23998?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Fleetdm Fleet

CVE-2026-23998

Fleet is open source device management software. Prior to version 4.81.0, a vulnerability in Fleet’s Windows MDM management endpoint could allow requests to be processed without proper client certificate validation. In certain circumstance…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (1.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Fleetdm Fleet — versions < 4.81.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-23998?: CVE-2026-23998 is a high-severity vulnerability in Fleetdm Fleet, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2026-05-14.
How severe is CVE-2026-23998?: High severity. CVSS v3 base score is 7.5 out of 10.