CVE-2026-23518
Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment in github.com/fleetdm/fleet
EPSS 0.06%
Description
Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment in github.com/fleetdm/fleet
How to fix CVE-2026-23518
To remediate CVE-2026-23518, upgrade the affected package to a fixed version below.
- Go/github.com/fleetdm/fleet—upgrade to 4.78.3 or later
- Go/github.com/fleetdm/fleet/v4—upgrade to 4.75.2 or later
Is CVE-2026-23518 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 4.78.0, < 4.78.3
- >= 4.75.0, < 4.75.2, >= 4.76.0, < 4.76.2, >= 4.77.0, < 4.77.1, >= 4.78.0, < 4.78.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |